a-a a-b a-c a-t aaa aab aac aak aas aat aau ab- aba abb abc abk abs abt abu ac- aca acb acc ack acs act acu aka akb akc akk aks aku as- asa asb asc ask ass ast asu at- ata atb atc ats att atu au- aua aub auc auk aus aut b-u baa bab bac bak bas bat bau bba bbb bbc bbk bbs bbt bbu bca bcb bcc bck bcs bct bcu bka bkb bkc bkk bks bkt bsa bsb bsc bsk bss bst bsu bta btb btc btk bts btt btu bua bub buc buk bus but buu c-- caa cab cac cak cas cat cau cba cbb cbc cbk cbs cbt cbu cca ccb ccc cck ccs cct ccu cka ckb ckc cks ckt csa csb csc csk css cst csu cta ctb ctc ctk cts ctt ctu cua cub cuc cuk cus cut cuu k-t ka- kaa kab kac kak kas kat kau kba kbb kbc kbk kbs kbu kca kcb kcc kck kcs kct kcu kkb kkc kkk kks kkt kku ksa ksb ksc ksk kss kst ksu kta ktb ktc ktk kts ktt ktu kub kuc kuk kus kut kuu saa sab sac sak sas sat sau sba sbb sbc sbk sbs sbt sbu sca scb scc sck scs sct scu sk- ska skb skc skk sks skt sku ss- ssa ssb ssc ssk sss sst ssu sta stb stc stk sts stt stu sua sub suc suk sus sut suu taa tab tac tak tas tat tau tba tbb tbc tbk tbs tbt tbu tca tcb tcc tck tcs tct tcu tka tkb tkc tkk tks tkt tsa tsb tsc tsk tss tst tsu tta ttb ttc ttk tts ttt ttu tua tub tuc tuk tus tut tuu ua- uaa uab uac uak uas uat uau uba ubb ubc ubk ubs ubt ubu uca ucb ucc uck ucs uct ucu uka ukb ukc ukk uku usa usb usc usk uss ust usu uta utb utc utk uts utt utu uua uuc uus uut uuu