Nagarjuna Meka

adigcz@r.postjobfree.com, Mobile: 571-***-****

PROFESSIONALSUMMARY:

11+ years of IT experience in Database Administration including analysis, design, development, maintenance, testing, documentation, implementation and user training/support. Configuration and maintenance of oracle 12c, 11g,10g,9i databases and applying patches as required under Linux, HP UX, Sun Solaris, AIX and Windows platforms.

Full scale Golden Gate implementation experience across different databases.

Setup GoldenGate replication to replicate data across different platforms.

Migrated databases to Cloud environment.

Worked on administration of Oracle 12c/11g/10g/9i databases.

Experience working as Oracle DBA in Linux, HP-Ux, Solaris, AIX and Windows environments.

Thorough knowledge of Software Development Life Cycle (SDLC) with respect to database design, implementation and maintenance

Migrated Oracle databases from Physical servers to Cloud environements (AWS, AT&T Cloud).

Experience in Dataguard Configuration, Implementing and maintaining Standby Databases, Active Dataguard and Snapshot Standby.

Worked extensively on Very Large Databases (VLDB) ranging from 100 GB to 40 TB.

Having good knowledge about Physical and Logical structure of a database.

Maintained catalog server and involved in registering the databases in catalog server.

Hands on experience in Grid Control 10g & 11g and installed 12c for database monitoring/Performance/Diagnostics

Experienced in Clusterware (Grid Infrastructure)-CRS management and configuration.

Extensively experienced in Oracle Database monitoring and Tuning using Grid control/Oracle Enterprise Manager (OEM) monitoring.

Expert in Partitioning Administration: creating, managing, pruning and merging the partitioned tables

Comprehensive experience as Oracle DBA, especially in Exadata and Oracle Goldengate.

Experienced in Oracle GoldenGate installation, configuration, troubleshooting GoldenGate EXTRACT and REPLICAT.

Expertise in replication technologies including GoldenGate, Streams, and Materialized Views.

Used Data masking to protect private and confidential data by replacing sensitive information with dummy data Experience in Performance Tuning.

Configured Oracle data guard in both models i.e. physical and logical model for backup and reporting.

Performed Flashback features to handle efficient database recovery and implementing restore points for testing.

Experience in backup and cloning using RMAN procedures.

Designed and implemented Database Backup and Recovery strategies using RMAN, OEM.

Experienced in fixing the Performance issues in Data guard/RAC.

Experience in Data Migrations using oracle Export/Import, Data Pump, RMAN, SQL*Loader.

Experienced in Unix Shell scripts for backups, export and import of database.

Configured Kereberos authentication for Oracle databases.

Perform Daily Monitoring of Oracle instances using Oracle Enterprise Manager, ADDM, monitor users, table spaces, memory structures, rollback segments, logs, and alerts.

Resolved shared memory allocations, long transactions, locking issues and deadlocks.

Good at monitoring server performance, database transaction log growth and error logs.

Implemented and configured Oracle Advanced Security features to protect sensitive data.

Experience in Unix Shell and Perl Scripting for automating the DBA tasks

Expertise in maintaining Database Security using security compliance auditing, expertise in loading data from flat files using external tables, SQL*Loader.

Expertise in Performing Database Tuning - Tuning involved I/O, Memory, CPU utilization, SQL Tuning, SGA tuning, Shared Pool tuning, Buffers and Disk I/O tuning using Oracle’s regular performance tuning tools like Explain Plan, Statspack, SQL*Trace, Tkprof.

Experienced with hardware sizing and capacity planning.

Having good knowledge of NoSQL databases especially MongoDB.

Performance tuning of the database - SQL Tuning, Used Tuning utilities like AWR, and ADDM.

EDUCATIONAL QUALIFICATIONS:

Masters in Information Systems, Stratford University, 2016.

Bachelors in Technology (Information Technology), JNTU, Hyderabad, India, 2005.

PROFESSIONALEXPERIENCE:

Carrier Corporation, Palm Beach Gardens, FL Apr ’20 to current

Sr. Oracle DBA

Responsibilities:

Installation, Maintenance and monitoring of the database software products (11g, 12c), including applying patches as required.

Configure and manage Oracle Real Application Clusters (RAC) for high availability and fault tolerance.

Plan and implementation of DataCenter Migration of Oracle Databases and applications.

Database migration from on-premises data center to cloud infrastructure.

Migrated Oracle databases from Physical servers to AWS RDS Cloud databases and EC2 instances.

Upgrade databases from Oracle 11G to Oracle 12C version through in-place/out-of-place upgrades process.

Configure and manage oracle grid infrastructure along with Automatic storage management (ASM).

Defining backup strategy and validating the backups quarterly by performing restores and recoveries using Recovery manager utility (RMAN).

Configuring and managing enterprise user security for database authentication and authorization.

Configure and manage Dataguard physical standby databases for disaster recovery. Perform disaster recovery testing yearly as part of business continuity plan.

Perform schema/table refresh via EXPDP/IMPDP.

Setup of Oracle Transparent Data Encryption (TDE) on both tablespace and column level to encrypt data.

Providing on-call support (24/7) to address operational issues.

Archiving data in warehouse environment as per the retention policy.

Configure Oracle Advanced Security features such as Data Masking and redacting for hiding PII data.

Work with application team and perform non-prod environment refresh using data pump for testing purpose.

Analyze the database performance and address performance bottlenecks.

Install and maintain Oracle 13c cloud control for database infrastructure monitoring and administration.

Assist in the management of the hardware and software as related to the operations of the Oracle, including system development, maintenance, and recommendations of purchases of new hardware and software.

Create DBMS scheduler jobs as required to schedule the jobs on oracle database.

Analyze current utilization and perform capacity planning for database systems.

Archival of Big Table data using archival/purge scripts to maintain data retention policy.

Automate regular repeated tasks using shell scripting/python.

Maintain database security standards to meet SOX compliance.

Involved in System Integration Testing (SIT) and User Acceptance Testing (UAT) of products before moving the application to Production.

Regular monitoring of cluster/databases for performance/network/System IO Wait issues using OEM (Oracle Enterprise Manager) Grid Control Interface.

Analyze the Database Migration requirement and providing an efficient and workable solution. Work with Project Managers to understand different client’s requirement and provide an efficient solution keeping in mind the methodology, duration and resources.

Ensuring development standards are adhered to and functional, performance and security requirements are met.

Documenting functional and technical requirements as needed.

Analyzing Problem Reports to identify the root cause and recommend and/or implement code changes to correct the defect.

Environment: Oracle 12c/11g, RAC, ASM, SQL Server, Oracle GoldenGate 12, OEM, IIS, PL/SQL, Export/Import DataPump, RMAN, TOAD, Erwin, AWS RDS, EC2, S3, SQL*Loader, Oracle 13c Cloud Control, ETL, Data Warehouse, RedHat Linux 7.

United Technologies Corporation, Farmington, CT (www.utc.com) Feb ’19 to Apr’20

Sr. Oracle DBA

Responsibilities:

Installation, Maintenance and monitoring of the database software products (11g, 12c), including applying patches as required.

Configure and manage Oracle Real Application Clusters (RAC) for high availability and fault tolerance.

Data Center migration of Prod/Non-Prod databases.

Upgrade databases from Oracle 11G to Oracle 12C version through in-place/out-of-place upgrades process.

Configure and manage oracle grid infrastructure along with Automatic storage management (ASM).

Defining backup strategy and validating the backups quarterly by performing restores and recoveries using Recovery manager utility (RMAN).

Configuring and managing enterprise user security for database authentication and authorization.

Configure and manage Dataguard physical standby databases for disaster recovery. Perform disaster recovery testing yearly as part of business continuity plan.

Perform schema/table refresh via EXPDP/IMPDP.

Plan and implementation of DataCenter Migration of Oracle Databases and applications.

Migration using Oracle Goldengate replication for zero downtime.

Configured Kereberos authentication for Oracle 12c databases.

Setup of Kereberos authentication for end users.

Troubleshooting kerberos logins for the end users.

Installed and configured High availability golden gate uni directional replication for real time replication.

Troubleshooting and Performance tuning of Golden gate replication.

Setup of Oracle Transparent Data Encryption (TDE) on both tablespace and column level to encrypt data.

Manage and maintain Oracle Exadata Engineered systems.

Providing on-call support (24/7) to address operational issues.

Archiving data in warehouse environment as per the retention policy.

Configure Oracle Advanced Security features such as Data Masking and redacting for hiding PII data.

Work with application team and perform non-prod environment refresh using data pump for testing purpose.

Analyze the database performance and address performance bottlenecks by tuning database/operating system parameters.

Install and maintain Oracle 13c cloud control for database infrastructure monitoring and administration.

Assist in the management of the hardware and software as related to the operations of the Oracle, including system development, maintenance, and recommendations of purchases of new hardware and software.

Create DBMS scheduler jobs as required to schedule the jobs on oracle database.

Analyze current utilization and perform capacity planning for database systems.

Archival of Big Table data using archival/purge scripts to maintain data retention policy.

Automate regular repeated tasks using shell scripting/python.

Maintain database security standards to meet SOX compliance.

Involved in System Integration Testing (SIT) and User Acceptance Testing (UAT) of products before moving the application to Production.

Regular monitoring of cluster/databases for performance/network/System IO Wait issues using OEM (Oracle Enterprise Manager) Grid Control Interface.

Analyze the Database Migration requirement and providing an efficient and workable solution. Work with Project Managers to understand different client’s requirement and provide an efficient solution keeping in mind the methodology, duration and resources.

Ensuring development standards are adhered to and functional, performance and security requirements are met.

Documenting functional and technical requirements as needed.

Analyzing Problem Reports to identify the root cause and recommend and/or implement code changes to correct the defect.

Environment: Oracle 12c/11g, RAC, ASM, SQL Server, Oracle GoldenGate 12, OEM, IIS, PL/SQL, Export/Import DataPump, RMAN, TOAD, Erwin, AWS RDS, EC2, S3, SQL*Loader, Oracle 13c Cloud Control, ETL, Data Warehouse, RedHat Linux 7.

Texas Education Agency, Austin, TX Jul ’18 to Jan ‘19

Sr. Database Administrator

Responsibilities:

Administering and maintanance of Oracle 12c databases for RF Tracker / Core applications.

Worked on Oracle Data Warehouse databases and created data stores for applications.

Developed normalized Logical and Physical database models.

Carried out requirement analysis, capacity planning to create data stores.

Identified, formulated and documented detailed business rules and Use Cases based on requirements analysis.

Gathered the requirements from data architects and performed technical analysis to reach a viable solution.

Created Physical Data Model with DDL that best suits the requirements from the Logical Data Model.

Created ad-hoc SQL queries using joins, database connections and transformation rules to fetch data from legacy SQL Server database systems.

Good experience in Data Modeling (using ERWIN, Power Designer), Data mart and OLAP for business analysis using Star & Snowflake schemas for faster and effective querying.

Designed and created database objects like Tables, Indexes, Views, Synonyms, MViews.

Designed and developed PL/SQL functions/ stored procedures/ cursors/ triggers/ packages.

Developed PL/SQL ETL scripts to transfer data across the schemas and databases.

Performed SQL and PL/SQL tuning using tools like EXPLAIN PLAN, SQL*TRACE, AWR, TKPROF and AUTOTRACE.

Written complex SQL Statements, Complex Joins, Co-related Sub-queries and SQL Statements with AnalyticalFunctions.

Written Exception Handling for debugging and maintainability.

Designed and developed data loading processes using PL/SQL and UNIX Shell scripts.

Worked in Agile methodology process and participated in Sprints.

Used and maintained version control of code/scripts in SVN.

Supporting application developers on oracle issues.

Provided SQL and PL/SQL code tuning to improve database response time and performance for several applications.

Unix Shell scripts for backups, export and import of database.

Applied standard procedures and documentation of the process.

Experience in Performance Tuning in Data warehousing.

Created Partition tables in Data Warehouse databases.

Environment: Oracle 12c/11g, Exadata, SQL Server 2014, DB2, OEM, Erwin, PL/SQL, Export/Import DataPump, TOAD, SQL*Loader, SQL Developer, ETL, Data Warehouse, Agile, RedHat Linux.

AT&T, Austin, TX Jan '17 to Jun ‘18

Sr. Oracle DBA, Golden Gate DBA

Responsibilities:

Working in operation management team to handle day-to-day database issues, worked in onshore/offshore model and ensured 24*7 availability.

Administering Operational and Data Warehouse databases for Analytics.

Migrated Operational and data warehouse databases to Cloud servers using Oracle Golden Gate.

Configured and administration of Oracle 12c/11g RAC databases and data guard standby databases.

Data archival of big tables by moving data to archival database to maintain the rentention policy.

Implemented In-Memory feature for faster processing of complex queries in oracle 12c data warehouse database.

Worked with data modelers for design, development of data warehouse database and normalization of data.

Installation and Configuration of Oracle Golden Gate replication on 11g and 12cdatabases.

Setup, administer and troubleshoot golden gate replication issues across database environment.

Implemented advanced compression on oracle 12c database for data warehouse.

Creating parameter files for Extract, Data Pump and Replicat processes in Golden Gate.

Configured Disaster Recovery databases through Data Guard and Golden Gate replication.

Performance tuning of Golden Gate processes on source and target databases.

Upgraded Oracle Golden Gate from 11g to 12c.

Data masking to protect personal/sensitive data.

Experience in Performance Tuning in Data warehousing.

Creating Partition tables in Data Warehouse databases.

Working on Range, Interval partitions in data warehouse.

Administer and Monitor Space Management in Production and lower production environments.

Backup and cloning using RMAN procedures.

Data Migrations using oracle Export/Import, Data Pump, RMAN, SQL*Loader.

Performing regular upgrades and quarterly CPU patching.

Unix Shell scripts for backups, export and import of database.

Monitoring Golden Gate Errors/Abends notification alerts with scripts.

Supporting application development on oracle products.

Automated monitoring to send notifications for management and concerned team using the scripts.

Worked with Oracle Support for troubleshooting of technical issues.

Configured Oracle Database Vault protection.

Monitoring and maintenance of multiple databases for production, development, testing and Staging purposes using utilities like OEM and Toad.

Maintain data security by creating views, DB owners/users and granting/revoking permissions and roles.

Environment: Oracle 12c/11g, OEM 12c, RAC, DB2, Data Guard, Cloud, Oracle GoldenGate, PL/SQL, Export/Import DataPump, SQL*Loader, RMAN, TDE, OBIEE, Erwin, Informatica, ETL, Data Warehouse, RedHat Linux, VMware, Zerto, Agile, iTrack/Jira.

Austin Energy, Austin, TX Oct ’15 to Dec '16

Sr. Oracle DBA

Responsibilities:

Installing, Configuring, patching and managing Oracle 12c/11g/10g/9i RAC and standalone Databases.

Worked on 2 node RAC performance issues related to RAC Cluster, ASM and Cluster Interconnect issues.

Provided on-call production database support.

Worked on oracle 12c Upgrade from 11g R2 using DBUA.

Worked on Disaster recovery or Business continuity program to step up all Exadata servers using RMAN techniques

Experienced in Installation and configuration Oracle GoldenGate for Data warehouse environment.

Handled Development and production support incidents. Worked with application teams to handle failover and switchover scenarios and handled any database and replication issues occurring during this process

Configure Data guard broker between the primary and standby databases, perform Switchover/Failover and monitor the Dataguard status.

Implemented data security using transparent data encryption (TDE).

Performed Schema as well as table level Replication using Oracle GoldenGate and set up of Disaster Recovery solution using GoldenGate.

Configured Extract and Replicate pumps for Golden gate replication and troubleshooting issues in GoldenGate Environment.

Implemented Oracle Advanced Security with Key Vault and Tablespace encryption.

Used DEFGEN utility to create definition files, log dump utility to analyze trail files, implemented heartbeat tables to monitor lag in Golden Gate environment, migrated oracle databases with minimal down using Oracle GoldenGate.

Monitoring Health checks of OCR, VOTING-DISKS and troubleshooting issues in RAC environment (11GR2).

Expertise at Installing of Oracle RAC with Clusterware and ASM.

Experienced in using 11g, 10g features Data Pump, Flash-Back Recovery, AWR, ASM, ADDM, Grid Monitoring, Recycle Bin.

Performed capacity planning, Extracting, Transforming and Loading (ETL) data using SQL*Loader and External Tables.

Experienced and troubleshooting the cell nodes in Exadata servers

Enhancements to Materialized views for faster generation of OBIEE reports.

Configured ASM disk groups to store Data files, redo log files, and control files.

Expertise with different Backup and Recovery strategies, Cloning (using Recovery Manager - RMAN), creating RMAN scripts, VERITAS Net Backup, Export / Import, DataPump, TTS, and Hot and Cold back-ups.

Performing periodical Backup and Restoration and recovery using RMAN (full & incremental) and RMAN incrementally updated backups.

Analyzed and monitored wait events on production databases to implement improvements for buffer busy waits/sequential & scattered read contentions.

Experienced in Bulk Loading of data from flat files using SQL*Loader.

Extensively experienced in Oracle Database monitoring and tuning using Oracle Enterprise Manager (OEM) monitoring.

Developed advanced shell scripts, SQL and PL/SQL scripts in support of database operations

Data migration between environments using Export/Import, Expdp/Impdp, Transportable Tablespace, and Oracle Streams.

Migrated the production database from slower Disks to faster I/O disks with zero downtime.

Expertise in creating Users, Roles and Profiles and Privilege management with role-based security.

Applied relevant security patches for both operating systems and oracle.

Setup of Oracle Connection Manager on client machines to access database.

Performed database tuning using Explain Plan, Hints, Toad, AWR, ADDM and Enterprise Manager.

Application Tuning by tuning queries, identifying problematic code, creation of indexes, re-writing queries using an optimized path, creation of materialized Views and gathering necessary statistics on objects

Provided advanced technical troubleshooting for applications and database systems with emphasis on root cause analysis.

Monitored the performance on UNIX Servers using TOP, VMSTAT, IOSTAT, NETSTAT and SAR.

Analyzing slow-running SQL queries and generating statistics using the Execution Plan and recommended solutions for faster execution.

Environment: Oracle 12c/11g/10g, OEM, Erwin 4.0, Exadata, ODA,RAC, Data Guard, Oracle GoldenGate, PL/SQL, Export/Import DataPump, SQL*Loader, DB2, TDE, RMAN, OBIEE,AIX, Jira, Linux 5.0, Agile, VMware.

Hibu, India Dec‘12 – Jun ’14

Oracle DBA

Responsibilities:

Database Installation and embedding oracle base software into the product on multiple platforms.

Supported Oracle 11g, 10g and Oracle 9i Databases of Production, Testing, Staging, Dev and Training environments.

Installation, Configuration and Maintenance of Oracle 11g primary and standby database.

Configured Oracle Grid Control for monitoring databases.

Data Migration as part of enterprise data warehouse project.

Setup Oracle Golden Gate software and configured unidirectional replication.

Configured extract, replicat processes for replication of data.

Troubleshooted Lag in replication and resolved the issues by setting range filter and other parameters.

Provide backup/recovery, problem diagnosis, performance tuning, data reorganization, and database upgrade support.

Administer, maintain, develop and implement policies and procedures for managing DB security and alert log entries.

Resolve database performance issues, database capacity issues, and distributed data issues.

Developed RMAN scripts for backup and recovery of databases.

Worked on import/export, export data pump/import data pump and SQL Loader.

Installation, Configuration and Maintenance of Oracle 11g RAC database on Linux.

Cloning databases using RMAN as well as scripts.

Database Design, Schema Design, Performance Monitoring, Tuning.

Write monitoring/health check scripts to alert team of database uptime/downtime status, sizing issues, which ensured availability.

Supporting Informatica and OBIEE application and other SLA requirements.

Involved in disaster recovery procedures and performed Backup/recovery.

Recovery of Database from Media Failure, recovering tables dropped accidentally, recovering data files, recovering from Block Corruption.

Safe Guarding Customer Data by ensuring that tables with sensitive and critical data can be accessed by only selected group of users as per client requirement.

Migration of data from SQL Server 2005 using DTS and loaded into oracle Database.

Using explain plan utility to analyze the cost involved in query processing and tune it for faster retrieval.

Created Indexes-Bitmap/Join Indexes, Function-Based Indexes as per the given structures, operations, data in the tables for increased performance.

Support of database with features like partitioning with PL/SQL calls to collect stats, Index maintenance.

Implemented database security by setting up auditing, roles and privileges.

Worked on performance tuning of SQL and Procedures and packages.

Created cron jobs in production to automate database tasks.

Environment: Oracle 11g, 10g/9i/ 8i, DB2, Dataguard, RAC, Red Hat Linux, Golden Gate, Expdp/Impdp, UNIX Scripting, OBIEE, Informatica, Agile, PL/SQL.

Penna Group, India Jul’10–Nov’12

Database Administrator and System Administrator

Responsibilities:

Planning, Installation and Configuration of Oracle Database on the Server.

Installed Oracle 10g R2 databases on HP-Ux, AIX and Linux platforms.

Worked in In-house Data Center and managing enterprise servers which includes HP Itanium, HP Blade, IBM Power Series, IBM x86servers, HP Data Protector Robotic, HP EVA Storage contains Prod, Stage, Test, Dev databases.

Administered Oracle 10g and 9i databases in Production, Stage and Dev environments.

Worked on oracle patches using OPatch utility.

Configured data warehouse environment on oracle 10g.

Providing periodic reports from reporting database.

Coordinating Backup and Recovery operations over all databases, ensuring 100% recoverability.

Installed MySQL database for PAS application.

Automated tasks using Shell Scripting.

Used RMAN for backup and recovery jobs

Create & Manage Database Structure, Storage Allocation, Table/Index segments, Rollback segments, Constraints, Database Access, Roles and Privileges. Created multiple Raid levels using volume manager.

Performing Daily, Weekly and Monthly Oracle monitoring and maintenance tasks.

Migrated databases from HP-Ux to IBM AIX.

Wrote Stored Procedures for input to SQL*Loader utilities for loading data from external files into the Oracle database.

Responsible for network configuration and involved in a Client –Server environment using TNS, LISTNER, Net Configuration Assistant and other configuration files.

Creation of Table space, Data files, Indexes, Rollback Segment and monitoring them.

Creation of Users and Granting them privileges and roles.

Used extensive Sub Queries, PL/SQL procedure, DDL functions, database triggers and packages.

Designed logically and configured oracle RDBMS on UNIX for better management of databases.

Responsible for writing database programming to Store/Retrieve the information from the database using SQL.

Responsible for physical and logical backups of database.

Performed Database Tuning. Performed Database Security and Integrity.

Monitoring the data loading jobs.

Environment: Oracle 10g, 9i, 10g iAS, PL/SQL, MySQL, MS SQL Server,AIX, HP-Ux 11.x,KSH, BASH, IBM P Series, HP Blade, HP Data Protector, EVA, Red Hat Linux, SQL*PLUS, Export/Import.

JCS, India Dec'07 – Jul'10

Oracle DBA

Responsibilities:

Collected user requirements, writing user requirement documents, developing project plans

Installed Oracle 10g R2 databases on AIX and Linux platforms

Involved in migration of Oracle 8i database to 9i on AIX platform

Performing Daily, Weekly and Monthly Oracle monitoring and maintenance tasks.

Creation of Table space, Data files, Indexes, Rollback Segment and monitoring them.

Responsible for network configuration and involved in a Client –Server environment using TNS, LISTNER, Net Configuration Assistant and other configuration files.

Creation of Users and Granting them privileges and roles.

Responsible for physical and logical backups of database.

Performed Database Tuning. Performed Database Security and Integrity.

Developed PL/SQL stored procedures with the implementation of Oracle binding variables and dynamic SQLs to gain performance for HMIS reporting system

Coordinating with the system and network group on server and database maintenance activities

Performing application/SQL tuning, employing advanced Oracle technologies such as partitioning, function indexes, bitmap indexes.

Create & Manage Database Structure, Storage Allocation, Table/Index segments, Rollback segments, Constraints, Database Access, Roles and Privileges.

Worked on oracle patches using OPatch utility.

Coordinating Backup and Recovery operations over all databases, ensuring 100% recoverability.

Used RMAN for backup and recovery jobs

Managing of database objects like Tables, views, indexes.

Designed batch jobs which are used in loading data into UNIX shell scripts.

Used SQL Loader and UNIX Shell Scripts to load the daily data in to HMIS database.

Created control file to load data from flat files obtained from various interfaces using SQL*Loader.

Extensively worked on Explain Plans and various hints for Performance tuning.

Involved in writing functional and technical documents.

Hands on in optimizing SQL queries by reading Explain plan statistics.

Developed Database objects like tables, Indexes, triggers for Reporting Database.

Created Jobs in database as per the requirement of application.

Environment: Oracle 8i, 9i, 10g, SQL *PLUS, Exp/Imp, AIX, Redhat Linux, SQL *Loader, SQL Developer, PL/SQL.

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