kurd kuri kurk kurr kurs kurt kuru kusb kusc kusd kust kusu kuti kutr kuts kutt kutu kuub kuuk kuur kuuu rbbb rbbr rbbs rbds rbis rbsd rbss rbst rcbc rccb rccc rccs rcdc rcds rcic rcid rcis rcrd rcsc rcsd rcsi rcss rctc rcti rcts rib- ribs ribu ricc rick rics rict ridc ridd ridi rids riis riki rikk riku riri rirs risc risd risi risk riss rist risu riti rits ritt ritu rius rkss rkts rrrr rsbi rscc rscs rsdd rsds rsid rsis rsts rstu rtcc rtdt rtss rtts rubb rubi rubs rubu ruci ruck ruct rudd rudi ruds ruid ruis ruit ruki rukk ruku rurc rurd ruri rurs ruru rusi rusk russ rust rusu ruti ruts rutt rutu ruud s-ib s-ic s-ii sbbs sbcc sbcs sbct sbds sbic sbrk sbsd sbsi sbst sbtc sbtk sbus scbi sccc sccs scct scdc scds sci- scic scid scir scis scit sck- scr- scrc scri scrs scsc scsd scsi scsr scst scsu sctc sctd sctr scts scub scud scur scut sdcc sddc sdds sdib sdic sdrc sdrs sdsc sdss sdsu sibc sibi sibs sibu sicc sici sick sics sicu sidd sidi sidr sids siik siit siki sikr siks siku sirc siri sirk sirr sirs sirt siru sisc sisd sisi sisk siss sist sisu sit- sitc sitd siti sits sitt situ siui sius siut skic skid skik skir skis skit skiu skrt sksd skss skud skui skur skut srbc srcc srct srib sris srsd srtr srub ssbr sscc ssci sscs ssdc ssdd ssid ssis ssit ssrc ssri ssrs sssb sssc sssi ssss sstb sstc sstd ssts stbc stbd stbs stcc stcs stcu stds stib stic stid stik stir stis stit stks strc strd stri strk strs stru stsi stss sttc sttd sttr stub stuc stud stuk stur stus stut sub- subb subd subi subs suc- succ suci suck sucr sucs sudd sudi suds suid suir suis suit suki suks suku sur- surc surd suri surr surs surt suru sus- susd susi susk suss sust susu suti sutu suus tbbs tbcb tbcc tbcd tbit tbrb tbst tcbs tccc tccu tcdd tctc tcts tddb tdis tdkr tdri tdss tibi tibs tibu ticc tick tics tidc tidd tids tiit tiiu tiki tiku tirb tird tiri tirr tirs tiru tisb tisi tiss tist titc titi tits titt titu tkts trcc tri- trib tric trik tris trit trsd trsi trst trtc trtr trub truc trud truk trus trut truu tsbc tsbd tscc tsdb tsid tsis tsks tssi tssr tsst tstc tsts tsui ttbb ttss tttt tubb tubr tubs tubu tucc tuck tudi tudu tuik tuis tuit tuiu tuks turb turc turd turi turk turr turs turt turu tusc tusd tusi tusk tuss tust tuti tuts tutt tutu ubbi ubic ubid ubii ubik ubir ubis ubit ubud ucbc ucci ucdc ucdd ucrc ucsb ucsc ucsd ucst ucsu ucut udbc uddi udds udic udid udir udsd udts uduk uirr uisd uist uits ukcc ukrc uksc ukur urbi urbs urci urds urdu urib uric urik uris uriu urri ursi urss ursu urts uruk urur urus urut us-k usbc usbr usbs uscc uscs usdc usds usdt usis ussb ussc ussr usss usst ussu ustb ustc usti usts usui usus utid utik utis utri utsc utti uttu uuri uusi uuuu