ffff ffrr ffss fmsr fmss fofo fomo foof foom foos for- form foro forr fors foso foss from fros frsm frso fsfo fssf mfor mfrs mmff mmmm mmms mmor mmrf moff mofo momo moms moor moos morf moro mors moso moss msff msfs msmm msms msor mssf mssm mssr off- offo offr offs ofor omo- omoo omor omro ooff oofs ooms oooo ooos orff orfs ormo oro- orof orom oror oros orro orrs orso osm- osmo osoo osor osos osro osso roff rofo romm romo roms roof room roor roos roro roso ross rrrr rsos s-os sfmm sfor sfos sfro sfss smof smos smrf smss sofo somm somo soof soom soor soos sorm soro sorr sors soso soss sros ssrm ssrs sssf sssm ssss