-ous ffff ffrr ffss fftf fmsr fmss fofo fomo fomt foof foom foos foot for- form foro forr fors fort foso foss fost fotm foto fots fott four fous fout from fros frot frou frsm frso frst frum fsfo fssf ftos ftrs ftsr fuff fufu fumo fums fuor fur- furm furo furr furs furt fuso fuss fust fusu futo futs futu mfor mfou mfrs mftf mmff mmmm mmms mmor mmrf mmst mmsu mmts mmus moff mofo mofu momo moms momu moor moos moot morf moro mors mort moru moso moss most mosu motm moto mots mott motu mouf mour mous mout mrtm mrts mrtt msff msfs msft msmm msms msmu msor msrt mssf mssm mssr msst mstr msts msus mtff mtom mtor mtrr mtss mtst mttr mtts muff mufu mumm mumo mums mumu muos muro murr murs murt muru muso muss must musu muto muts mutt mutu muut off- offo offr offs offu ofor ofst ofus omo- omoo omor omro omuo omus ooff oofs ooms oooo ooos oort oost oots oous orff orfs orfu ormo oro- orof orom oror oros orot orro orrs orso orsu orto orts orum orus osm- osmo osoo osor osos osro osso ossu ostr osts osum oto- otof otoo otor otos otro otrs otso otsu otto otts ottu otur otus ouff our- ouro ours ourt oust out- outo outs ouu- rmst rmtu roff rofo romm romo roms roof room roor roos root roro rort roru roso ross rost roto rotr rots rott rouf roum rous rout rrrr rrum rsos rsts rstu rsum rtfm rtms rtss rtts ruff rufo ruft rumm rumo rums rumt ruro rurs ruru ruso russ rust rusu ruto ruts rutt rutu s-os sfmm sfor sfos sfro sfss sfsu sfts smof smos smot smrf smrt smss smtu smur smus smut sofo soft somm somo soof soom soor soos soot sorm soro sorr sors sort soru soso soss sost sotm soto sots sotu souf soum sour sous sout sros srtr ssot ssrm ssrs sssf sssm ssss ssts stfu stms stmt stof stom stoo stor stos stot stou stro strs stru stsf stsm stss sttr stuf stum stur stus stut suf- suff sufr sufs sufu sum- sumo sums sumu suor suos sur- surf suro surr surs surt suru sus- suso suss sust susu suto sutu suum suus t-mo tfot tfrs tfss tmos tmou tmro tmtt toff tofo toft tofu tomm tomo toms tomt toof toom toor toos toot torf torm toro torr tors tort toru toso toss tost tosu totm toto totr tots tott toum tour tous tout trfm trfr trms trmu trom troo tros trot trou trst trtr trus trut truu tsfm tsom tsos tsou tssf tssm tssr tsst tstm tsts tsum ttff ttms ttss tttt tuff tufm tufo tuft tufu tums tumu tuor tuos turf turm turo turr turs turt turu tusm tuss tust tuto tuts tutt tutu tuum tuuo ufms ufos umff ummo umms umor umsu umts umus umut uofm uofo uomo uor- urff urft uro- urom uroo urso urss ursu urts urum urur urus urut usfs usmm usms usos ussf ussr usss usst ussu ustm usto usts usus utfo utor utto uttu uutf uuuu