srtv srub ssbr sscc ssce sscs ssec ssee sses sset ssoc ssot ssrc ssrs sssb sssc ssss sstb sstc ssts st-v stbc stbs stcc stcs stcu stec stee steo ster stes stet stev stob stoe stoo stor stos stot stou strc stre stro strs stru stss sttc sttr stub stuc stue stur stus stut stuv stvs sub- subb subo subs suc- succ sucr sucs suee suer sues suet sueu suev suor suos sur- surc sure suro surr surs surt suru surv sus- suse suso suss sust susu sute suto sutu suus suvs svcc svce svcs svec svet svor svsc svtr tbbs tbcb tbcc tbce tbrb tbst tcbs tccc tccu tcos tcov tctc tcts tebo tebu teco tecr tecs tect teec teer tees teet teev teor teos ter- terc tere tero terr ters teru tesc tese teso tess test tete teto tetr tets tett tetu teut tobe tobo tobs tobt tobu toce toco toee toer toes toet toor toos toot torc tore toro torr tors tort toru torv tosb tosc tose toso toss tost tosu totc tote toto totr tots tott tour tous tout touv tove tovo trcc tre- trec tree treo tres tret treu trev troc troe troo tros trot trou trst trtc trte trtr trub truc true trus trut truu trvs tsbc tscc tsec tses tset tsob tsos tsou tsse tssr tsst tstc tsts ttbb tteo tter ttoe ttss tttt tubb tube tubo tubr tubs tubu tucc tuco tuer tues tuet tuor tuos turb turc ture turo turr turs turt turu tusc tuss tust tute tuto tuts tutt tutu tuuo tvbs tver tves tvos tvro tvrr tvss tvtv ubbe ubbo uber ubet uboc ubos ucbc uces ucos ucrc ucsb ucsc ucst ucsu uctv ucut uers uess uocc uor- uore uovo urbe urbs ure- ures uret uro- uroo urre urse urso urss ursu urte urts urur urus urut urve usbc usbe usbr usbs uscc usce usco uscs usee user uses uset usoc usoe usos usov ussb ussc usse ussr usss usst ussu ustb ustc uste usto usts usus utec uter utes utor utsc utto uttu uuoc uuuu uv-b uv-c uver uvvu vbcc vcrs vecc veer vees veet veor ver- verb vere vero vers vert vesc vese vess vest vete veto vetr vets veur veve vevo voce voer voes voet voeu vooc voor voot vor- vore voro vors vort voru vose voso voss vosu vote voto voue vour vous vout vreo vret vroc vrot vrse vrto vsee vses vsoe vssc vsse vsto vtec vtes vtrs vuco vues vurb vurt vuse vutv vver vvob vvsb vvvv