otbs otic otis otit oto- otoo otor otos otro otrs otso otsu otti otto otts ottu otur otus oubs oucc ouii ouir ouis ouit oumi our- ouro ours ourt oust out- outb outi outo outs ouu- rbbb rbbr rbbs rbis rbms rbss rbst rcbc rcbo rccb rccc rccs rcic rcis rcms rcos rcsc rcsi rcss rctc rcti rcts rib- ribo ribs ribu ricc rico rics rict riis rimi rimm rimo rims rimu riom rios riot riou riri rirs risc risi rism riso riss rist risu riti rito rits ritt ritu rius rmbs rmsc rmst rmtu rob- robb robi robo robs robt robu rocc roco rocs roio roir rois roit roiu romb romi romm romo roms roob rooi room roor roos root rorc rori roro rort roru rosc rosi roso ross rost rotc roti roto rotr rots rott roub roum rous rout rrmc rrrr rrum rsbi rscc rscs rsis rsos rsts rstu rsum rtcc rtcm rtmc rtmi rtms rtss rtts rubb rubi rubs rubu ruci ruct ruis ruit rumb rumi rumm rumo rums rumt rurc ruri ruro rurs ruru rusi ruso russ rust rusu ruti ruto ruts rutt rutu s-ib s-ic s-ii s-os sbbs sbcc sbcs sbct sbic sbmc sbor sbot sbsi sbst sbtc sbus scbi sccc sccm sccs scct sci- scic scim scio scir scis scit scmc scmm scmo scms scob scom scoo scor scot scr- scrc scri scrs scsc scsi scso scsr scst scsu sctc scto sctr scts scub scum scur scut sibc sibi sibo sibs sibu sicc sici sicm sico sics sicu siim siit simi simm simo sims simt sior sios siot siou sirc siri siro sirr sirs sirt siru sisc sisi siss sist sisu sit- sitc siti sito sits sitt situ siui sium sius siut smbc smcc smic smis smit smoc smos smot smrt smsc smss smtc smti smtu smur smus smut sobo sobr sobs sobt sobu soci socm soco socr socs soic soim soir sois soit somb somi somm somo soom soor soos soot sorb sori sorm soro sorr sors sort soru sosi soso soss sost sotc sotm soto sots sotu soum sour sous sout srbc srcc srct srib srim sris srmc sros srtr srub ssbr sscc ssci sscs ssis ssit ssmc ssoc ssot ssrc ssri ssrm ssrs sssb sssc sssi sssm ssss sstb sstc ssts stbc stbs stcc stcs stcu stib stic stim stio stir stis stit stmc stms stmt stob stom stoo stor stos stot stou strc stri stro strs stru stsi stsm stss sttc sttr stub stuc stum stur stus stut sub- subb subi subm subo subs suc- succ suci sucr sucs suio suir suis suit sum- sumi sumo sums sumu suor suos sur- surc suri suro surr surs surt suru sus- susi suso suss sust susu suti suto sutu suum suus t-mo tbbs tbcb tbcc tbit tbrb tbst tcbs tccc tccu tcom tcos tctc tcts tibi tibs tibu ticc tico tics tiit tiiu timi timm timo tims timu tios tiou tirb tiri tiro tirr tirs tiru tisb tisi tism tiso tiss tist titc titi tito tits titt titu tium tmbc tmbr tmcc tmcm tmos tmou tmro tmsc tmsi tmtt tobi tobo tobs tobt tobu toci toco tois toit tomb tomi tomm tomo toms tomt toom toor toos toot torc tori torm toro torr tors tort toru tosb tosc tosi toso toss tost tosu totc toti totm toto totr tots tott toui toum tour tous tout trcc tri- trib tric trim trio tris trit trmb trmi trms trmu troc troi trom troo tros trot trou trsi trst trtc trtr trub truc trus trut truu tsbc tscc tsis tsmc tsob tsoi tsom tsos tsou tssi tssm tssr tsst tstc tstm tsts tsui tsum ttbb ttim ttms ttss tttt tubb tubo tubr tubs tubu tucc tuco tuim tuis tuit tuiu tumb tumi tums tumu tuor tuos turb turc turi turm turo turr turs turt turu tusc tusi tusm tuss tust tuti tuto tuts tutt tutu tuum tuuo ubbi ubbo ubic ubii ubir ubis ubit uboc ubos ucbc ucci ucio ucmc ucom ucos ucrc ucsb ucsc ucsm ucst ucsu ucut uims uirr uist uits umb- umbi umbo umit ummo umms umor umri umsu umts umus umut uocc uomo uor- urbi urbs urci urib uric urim uris uriu urmi uro- urom uroo urri ursi urso urss ursu urts urum urur urus urut usbc usbr usbs uscc uscm usco uscs usim usis usmc usmm usms usoc usoi usos ussb ussc ussr usss usst ussu ustb ustc usti ustm usto usts usui usus utis utmb utor utri utsc utti utto uttu uuoc uuri uusi uuuu