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| REC | RECOMM | REV | REWTS | RF | RFC |
| RfD | RFK | RFL | RFLs | RFN | RFO |
| RFP | RG | RGB | RGE | RGG | RGM |
| RGN | RGP | RH | RHF | RHW | RI |
| RIAA | RIAW | RIB | RIBL | RIFK | RIHAD |
| RIK | RIKEN | RIP | RIQ | RIR | RIRS |
| RJ | RL | RLFC | RLH | RLI | RLM |
| RLN | RLRT | RLY | RM | RMA | RMAS |
| RMB | RMC | RMD | RMFT | RMH | RMK |
| RML | RMR | RMT | RMTA | RMW | RN |
| RNG | RNO | RO | ROCA | ROCL | ROF |
| ROFF | ROFL | ROFLAS | ROFLCGU | ROFLMAO | ROFLOL |
| ROI | ROL | ROLF | ROM | ROO | ROT |
| ROT13 | ROTFFL | ROTFL | ROTFLMAO | ROTFLMBO | ROTFLOL |
| ROTFLUTS | RPG | RPITA | RPM | RPS | RQD |
| RQN | RR | RRBD | RRD | RRDRP | RRR |
| RS | RS-232 | RS-422 | RS-423A | RSACi | RSB |