ffff ffss fftf fmss fofo fomo fomt foof foom foos foot foso foss fost fotm foto fots fott fsfo fssf ftos mftf mmff mmmm mmms mmst mmts moff mofo momo moms moos moot moso moss most motm moto mots mott msff msfs msft msmm msms mssf mssm msst msts mtff mtom mtss mtst mtts off- offo offs ofst omo- omoo ooff oofs ooms oooo ooos oost oots osm- osmo osoo osos osso osts oto- otof otoo otos otso otto otts s-os sfmm sfos sfss sfts smof smos smot smss sofo soft somm somo soof soom soos soot soso soss sost sotm soto sots ssot sssf sssm ssss ssts stms stmt stof stom stoo stos stot stsf stsm stss t-mo tfot tfss tmos tmtt toff tofo toft tomm tomo toms tomt toof toom toos toot toso toss tost totm toto tots tott tsfm tsom tsos tssf tssm tsst tstm tsts ttff ttms ttss tttt