REP MOVS/MOVSx          ; Move string from DS:[SI] to ES:[DI]
REP CMPS/CMPSx          ; Compare two strings from DS:[SI] and ES:[DI]
REP SCAS/SCASx          ; Scan string comparing AX with byte/word at ES:[DI]
REP LODS/LODSx          ; Load byte/word at address DS:[SI] into AX
REP STOS/STOSx          ; Store byte/word from AX to ES:[DI]

