a-a a-b a-c a-t aaa aab aac aak aan aas aat aau ab- aba abb abc abk abn abs abt abu ac- aca acb acc ack acn acs act acu aka akb akc akk akn aks aku an- ana anb anc ank ann ans ant anu as- asa asb asc ask asn ass ast asu at- ata atb atc atn ats att atu au- aua aub auc auk aun aus aut b-u baa bab bac bak ban bas bat bau bba bbb bbc bbk bbn bbs bbt bbu bca bcb bcc bck bcn bcs bct bcu bka bkb bkc bkk bkn bks bkt bna bnb bnc bnk bnn bns bnt bnu bsa bsb bsc bsk bsn bss bst bsu bta btb btc btk btn bts btt btu bua bub buc buk bun bus but buu c-- caa cab cac cak can cas cat cau cba cbb cbc cbk cbn cbs cbt cbu cca ccb ccc cck ccn ccs cct ccu cka ckb ckc cks ckt cn- cna cnb cnc cnn cns cnt cnu csa csb csc csk csn css cst csu cta ctb ctc ctk ctn cts ctt ctu cua cub cuc cuk cun cus cut cuu k-t ka- kaa kab kac kak kan kas kat kau kba kbb kbc kbk kbn kbs kbu kca kcb kcc kck kcn kcs kct kcu kkb kkc kkk kkn kks kkt kku kn- kna knc knk knn knt knu ksa ksb ksc ksk ksn kss kst ksu kta ktb ktc ktk ktn kts ktt ktu kub kuc kuk kun kus kut kuu naa nab nac nak nan nas nat nau nba nbb nbc nbk nbn nbs nbt nbu nca ncb ncc nck ncn ncs nct ncu nka nkc nkk nkn nks nkt nku nna nnb nnc nnk nnn nns nnt nnu nsa nsb nsc nsk nsn nss nst nsu nta ntb ntc ntk ntn nts ntt ntu nua nub nuc nuk nun nus nut nuu saa sab sac sak san sas sat sau sba sbb sbc sbk sbn sbs sbt sbu sca scb scc sck scn scs sct scu sk- ska skb skc skk sks skt sku sna snb snc snk snn sns snt snu ss- ssa ssb ssc ssk ssn sss sst ssu sta stb stc stk stn sts stt stu sua sub suc suk sun sus sut suu taa tab tac tak tan tas tat tau tba tbb tbc tbk tbn tbs tbt tbu tca tcb tcc tck tcn tcs tct tcu tka tkb tkc tkk tks tkt tna tnb tnc tnk tnn tns tnt tsa tsb tsc tsk tsn tss tst tsu tta ttb ttc ttk ttn tts ttt ttu tua tub tuc tuk tun tus tut tuu ua- uaa uab uac uak uan uas uat uau uba ubb ubc ubk ubn ubs ubt ubu uca ucb ucc uck ucn ucs uct ucu uka ukb ukc ukk ukn uku un- una unb unc unk unn uns unt unu usa usb usc usk usn uss ust usu uta utb utc utk utn uts utt utu uua uuc uun uus uut uuu