otis otit oto- oton otoo otor otos otro otrs otso otsu otti otto otts ottu otur otus oubs oucc ouii ouin ouir ouis ouit oun- our- ourn ouro ours ourt oust out- outb outi outo outs ouu- rbbb rbbr rbbs rbis rbss rbst rcbc rcbo rccb rccc rccs rcic rcis rcnr rcon rcos rcsc rcsi rcss rctc rcti rcts rib- ribo ribs ribu ricc rico rics rict riin riis rinn rino rion rios riot riou riri rirs risc risi riso riss rist risu riti rito rits ritt ritu rius rnbr rnco rncs rnin rnnt rnot rnut rob- robb robi robo robs robt robu rocc roco rocs roin roio roir rois roit roiu ronc roni rono rons ront roob rooi roon roor roos root rorc rori roro rort roru rosc rosi roso ross rost rotc roti rotn roto rotr rots rott roub roun rous rout rrrr rrun rsbi rscc rscn rscs rsis rsnn rsno rsnr rsos rsts rstu rtcc rtns rtss rtts rubb rubi rubs rubu ruci ruct ruin ruis ruit runc runi runn runo runs runt rurc ruri ruro rurs ruru rusi ruso russ rust rusu ruti ruto ruts rutt rutu ruun s-ib s-ic s-ii s-os sbbs sbcc sbcs sbct sbic sbor sbot sbsi sbst sbtc sbtn sbus scbi sccc sccs scct sci- scic scin scio scir scis scit scnr scnt scob scon scoo scor scot scr- scrc scri scrn scrs scsc scsi scsn scso scsr scst scsu sctc sctn scto sctr scts scub scun scur scut sibc sibi sibo sibs sibu sicc sici sico sics sicu siit sini sinn sino sins sint sinu sion sior sios siot siou sirc siri siro sirr sirs sirt siru sisc sisi siss sist sisu sit- sitc siti sitn sito sits sitt situ siui sius siut sncc snco snib snir snit snns snob snoc snoo snor snos snot snrs sntr snub snur snus sobo sobr sobs sobt sobu soci soco socr socs soic soin soir sois soit son- soni sono sons sont sonu soon soor soos soot sorb sori sorn soro sorr sors sort soru sosi soso soss sost sotc sotn soto sots sotu soun sour sous sout srbc srcc srct srib sris srni srnn srno sros srtr srub ssbn ssbr sscc ssci sscs ssin ssis ssit ssns ssoc ssot ssrc ssri ssrs sssb sssc sssi ssss sstb sstc ssts stbc stbs stcc stcs stcu stib stic stio stir stis stit stnn stnr stns stob ston stoo stor stos stot stou strc stri strn stro strs stru stsi stss sttc sttr stub stuc stun stur stus stut sub- subb subi subo subs suc- succ suci sucr sucs suin suio suir suis suit sun- sunb suni sunn suno suns sunt sunu suor suos sur- surc suri surn suro surr surs surt suru sus- susi suso suss sust susu suti suto sutu suus tbbs tbcb tbcc tbit tbrb tbst tcbs tccc tccu tcnn tcon tcos tctc tcts tibi tibs tibu ticc tico tics tiit tiiu tinc tini tinn tino tins tint tinu tion tios tiou tirb tiri tiro tirr tirs tiru tisb tisi tiso tiss tist titc titi tito tits titt titu tnbc tncc tnts tnut tobi tobo tobs tobt tobu toci toco tois toit tonb toni tonn tono tons tonu toon toor toos toot torc tori torn toro torr tors tort toru tosb tosc tosi toso toss tost tosu totc toti toto totr tots tott toui toun tour tous tout trcc tri- trib tric trin trio tris trit trno troc troi tron troo tros trot trou trsi trst trtc trtr trub truc trun trus trut truu tsbc tscc tsin tsis tsob tsoi tsos tsou tssi tssr tsst tstc tsts tsui tsun ttbb ttcn tton ttss tttt tubb tubo tubr tubs tubu tucc tuco tuin tuis tuit tuiu tunb tunc tuni tunn tuno tuns tunu tuor tuos turb turc turi turn turo turr turs turt turu tusc tusi tuss tust tuti tuto tuts tutt tutu tuuo ubbi ubbo ubic ubii ubir ubis ubit uboc ubon ubos ucbc ucci ucin ucio ucon ucos ucrc ucsb ucsc ucst ucsu ucut uint uirr uist uits uncc unci unco uncs unct uni- unic unii unin unio unir unis unit unni unno unns unon unos unro unrs uns- unsc unso unst untb unto unts unus unut uocc uor- urbi urbs urci urib uric urin uris uriu urni urns uro- uroo urri ursi urso urss ursu urts urun urur urus urut usbc usbr usbs uscc usco uscs usin usis usnc usno usnr usnu usoc usoi usos ussb ussc ussr usss usst ussu ustb ustc usti usto usts usui usun usus utin utis utor utri utsc utti utto uttu uuni uuno uuoc uuri uusi uuuu