| Acronyms starting in: O
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| OAB - Offline Address Book
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| OC - Optical Carrier
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| OC-3 - Optical Carrier level 3
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| OE - Outlook Express
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| OEM - Original Equipment Manufacturer
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| OMA - Outlook Mobile Access
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| OMFG - Oh My F'n God
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| OMG - Oh My God
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| OO - Object Oriented
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| OOB - Out Of Band
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| OOF - Out Of Frame
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| ORBS - Open Relay Blackhole System
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| ORBZ - Open Relay Blackhole Zone
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| ORDB - Open Relay DataBase
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| OS - Operating System
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| OSDN - Open Source Development Network
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| OSX - Operating System Ten
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| OTP - One-Time Password
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| Acronyms starting in: P
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| P/N - Part Number
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| P2P - Peer To Peer OR Point To Point
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| PABX - Private Automatic Branch eXchange
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| PAP - Password Authentication Protocol
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| PAT - Port Address Translation
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| PATN - Port Access Telephone Number
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| PB - PetaByte
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| PBM - Play By Mail
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| PBX - Private Branch eXchange
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| PC - Personal Computer
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| PCI - Peripheral Component Interconnect
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| PCL - Printer Control Language
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| PCMCIA - Personal Computer Memory Card International Association
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| PCN - Public Communications Network
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| PDF - Portable Document Format
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| PDN - Public Data Network
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| PDSN - Packet Data Serving Node
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| PEBCAK - Problem Exists Between Chair And Keyboard
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| PEBKAC - Problem Exists Between Keyboard And Chair
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| PERL - Practical Extraction Report Language
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| PGDN - PaGe DowN
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| PGP - Pretty Good Privacy
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| PGUP - PaGe UP
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| PHP - PHP: Hypertext Preprocessor
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| PID - Personal Identifier OR Process Identifier
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| PIF - Picture Interchange Format
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| PII - Pentium 2
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| PIII - Pentium 3
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| PIN - Personal Identification Number
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| PINE - Pine Is Not Elm
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| PING - Packet INternet Groper
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| PM - Private Message
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| PMP - Point to MultiPoint
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| PNG - Portable Network Graphics
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| POD - Proof of Deposit
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| POP - Point Of Presence OR Post Office Protocol
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| POP2 - Post Office Protocol 2
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| POP3 - Post Office Protocol 3
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| POS - Point Of Sale
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| POST - Power On Self Test
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| POTS - Plain Old Telephone Service
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| POV - Point Of View
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| PPC - PowerPC
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| PPP - Point to Point Protocol
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| PPPoA - Point-to-Point Protocol Over Atm
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| PPPoATM - Point-to-Point Protocol Over Asynchronous Transfer Mode
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| PPPoE - Point to Point Protocol Over Ethernet
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| PPPoI - Point to Point Protocol Over Isdn
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| PPT - PowerPoinT
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| PPTP - Point to Point Tunneling Protocol
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| PPVPN - Provider Provisioned Virtual Private Network
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| PS - PlayStation
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| PS/2 - Personal System 2
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| PS2 - PlayStation 2
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| PST - Public Switched Telephone
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| PSTN - Public Switched Telephone Network
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| PSU - Power Supply Unit
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| PtP - Point-To-Point
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| PTR - Point-in-Time Repair
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| PTT - Push To Talk
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| PW - PassWord
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| PWR - PoWeR
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| Acronyms starting in: Q
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| Q/A - Questions and Answers
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| QA - Quality Assurance
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| QC - Quality Control
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| QoS - Quality Of Service
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| QT - QuickTime
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| Acronyms starting in: R
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| R&D - Research & Development
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| R&R - Rip and Reinstall
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| R/O - Read Only
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| R/T - Receive/Transmit
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| R/W - Read/Write
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| RA - Remote Assistance
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| RAM - Random Access Memory
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| RAMDAC - Random Access Memory Digital to Analog Converter
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| RAND - RANDom
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| RAR - Resource Adapters aRchive
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| RAS - Remote Access Service
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| RASAPI - Remote Access Service Application Programming Interface
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| RBL - Realtime Blackhole List
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| RBOC - Regional Bell Operating Company
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| RC - Release Candidate
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| RD - Remote Desktop
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| RDL - Remote Digital Loopback
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| RF - Radio Frequency
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| RFC - Request For Comments
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| RFI - Radio Frequency Interference OR Request For Information
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| RG - Residential Gateway
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| RGB - Red Green Blue
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| RH - Request Header
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| RHCE - Red Hat Certified Engineer
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| RHCT - Red Hat Certified Technician
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| RIAA - Recording Industry Association of America
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| RMA - Return Material Authorization
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| RNA - Remote Network Access OR Ring No Answer
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| RNR - Rip and Reinstall
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| ROI - Return On Investment
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| ROS - Return on Service
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| RPC - Remote Procedure Call
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| RPM - Radio Packet Modem OR Red-hat Package Manager
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| RRAS - Routing Remote Access Service
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| RSH - Remote SHell
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| RSS - Really Simple Syndication
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| RTF - Rich Text Format
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| RTFM - Read The F'n Manual
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| RW - Read Write
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| RX - Receive
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| Acronyms starting in: S
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| S/MIME - Secure Multipurpose Internet Mail Extensions
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| S/N - Signal to Noise
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| S/PDIF - Sony/Phillips Digital Interface Format
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| SAP - Service Access Point
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| SARC - Symantec Antivirus Research Center
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| SCR - SCRipt
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| SCRN - SCReeN
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| SCSA - Sun Certified System Administrator
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| SCSE - Symantec Certified Security Engineer
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| SCSI - Small Computers System Interface
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| SCU - System Control Unit
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| SDDS - Sony Dynamic Digital Sound
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| SDK - Software Development Kit
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| SDR - Single Data Rate
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| SE - Second Edition
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| SEO - Search Engine Optimization
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| SFTP - Secure File Transfer Protocol OR Simple File Transfer Protocol
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| S-HTTP - Secure HyperText Transport Protocol
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| SIM - SIMulator
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| SIMM - Single In line Memory Module
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| SLA - Service Level Agreement
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| SLAN - Secure Local Area Network
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| SLB - Server Load Balancing
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| SLC - Subscriber Line Concentrator
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| SLD - Second Level Domain
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| SLIP - Serial Line Internet Protocol
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| SME - Subject Matter Expert
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| SMF - Single Mode Fiber
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| SMS - Short Message Service
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| SN - Serial Number
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| SNAFU - Situation Normal All Fouled Up
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| SNMP - Simple Network Management Protocol
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| SNR - Signal to Noise Ratio
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| SNTP - Simple Network Time Protocol
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| SOA - Start Of Authority
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| SOCKS - SOCKet Secure
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| SOHO - Small Office/Home Office
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| SONET - Synchronous Optical NETwork
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| SPARC - Scalable Processor ARChitecture
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| SPE - System Policy Editor
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| SPF - Shortest Path First
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| SPID - Service Profile IDentifier
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| SRC - SouRCe
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| SSH - Secure SHell
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| SSI - Server-Side Include
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| SSID - Service Set IDentifier
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| SSL - Secure Sockets Layer
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| STM - Synchronous Transfer Mode
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| STP - Secure Transfer Protocol
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| SVR - SerVeR
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| SYNC - SYNChronous
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| SYSADMIN - SYStem ADMINistrator
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| SYSLOG - SYStem LOG
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| SYSMOD - SYStem MODification
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| SYSOP - SYStem OPerator
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| SYSREQ - SYStem REQuest
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