a-a a-b a-c a-t aaa aab aac aak aar aas aat aau ab- aba abb abc abk abr abs abt abu ac- aca acb acc ack acr acs act acu aka akb akc akk akr aks aku ar- ara arb arc ark arr ars art aru as- asa asb asc ask asr ass ast asu at- ata atb atc atr ats att atu au- aua aub auc auk aur aus aut b-u baa bab bac bak bar bas bat bau bba bbb bbc bbk bbr bbs bbt bbu bca bcb bcc bck bcr bcs bct bcu bka bkb bkc bkk bkr bks bkt bra brb brk brr brs brt bru bsa bsb bsc bsk bsr bss bst bsu bta btb btc btk btr bts btt btu bua bub buc buk bur bus but buu c-- caa cab cac cak car cas cat cau cba cbb cbc cbk cbr cbs cbt cbu cca ccb ccc cck ccr ccs cct ccu cka ckb ckc cks ckt cra crb crc crk crr crs crt cru csa csb csc csk csr css cst csu cta ctb ctc ctk ctr cts ctt ctu cua cub cuc cuk cur cus cut cuu k-t ka- kaa kab kac kak kar kas kat kau kba kbb kbc kbk kbr kbs kbu kca kcb kcc kck kcr kcs kct kcu kkb kkc kkk kkr kks kkt kku kra krc krk krr krs krt kru ksa ksb ksc ksk ksr kss kst ksu kta ktb ktc ktk ktr kts ktt ktu kub kuc kuk kur kus kut kuu ra- raa rab rac rak rar ras rat rau rba rbb rbc rbk rbr rbs rbt rbu rca rcb rcc rcr rcs rct rcu rkb rkc rkk rks rkt rku rra rrb rrc rrk rrr rrs rrt rru rsa rsb rsc rsk rsr rss rst rsu rta rtb rtc rtk rtr rts rtt rtu rua rub ruc ruk rur rus rut ruu saa sab sac sak sar sas sat sau sba sbb sbc sbk sbr sbs sbt sbu sca scb scc sck scr scs sct scu sk- ska skb skc skk skr sks skt sku sr- sra srb src srk srr srs srt ss- ssa ssb ssc ssk ssr sss sst ssu sta stb stc stk str sts stt stu sua sub suc suk sur sus sut suu taa tab tac tak tar tas tat tau tba tbb tbc tbk tbr tbs tbt tbu tca tcb tcc tck tcr tcs tct tcu tka tkb tkc tkk tkr tks tkt tra trb trc trk trr trs trt tru tsa tsb tsc tsk tsr tss tst tsu tta ttb ttc ttk ttr tts ttt ttu tua tub tuc tuk tur tus tut tuu ua- uaa uab uac uak uar uas uat uau uba ubb ubc ubk ubr ubs ubt ubu uca ucb ucc uck ucr ucs uct ucu uka ukb ukc ukk ukr uku ur- ura urb urc urk urr urs urt uru usa usb usc usk usr uss ust usu uta utb utc utk utr uts utt utu uua uuc uur uus uut uuu