a-a a-b a-t aaa aab aak aan aas aat ab- aba abb abk abn abs abt aka akb akk akn aks an- ana anb ank ann ans ant as- asa asb ask asn ass ast at- ata atb atn ats att baa bab bak ban bas bat bba bbb bbk bbn bbs bbt bka bkb bkk bkn bks bkt bna bnb bnk bnn bns bnt bsa bsb bsk bsn bss bst bta btb btk btn bts btt k-t ka- kaa kab kak kan kas kat kba kbb kbk kbn kbs kkb kkk kkn kks kkt kn- kna knk knn knt ksa ksb ksk ksn kss kst kta ktb ktk ktn kts ktt naa nab nak nan nas nat nba nbb nbk nbn nbs nbt nka nkk nkn nks nkt nna nnb nnk nnn nns nnt nsa nsb nsk nsn nss nst nta ntb ntk ntn nts ntt saa sab sak san sas sat sba sbb sbk sbn sbs sbt sk- ska skb skk sks skt sna snb snk snn sns snt ss- ssa ssb ssk ssn sss sst sta stb stk stn sts stt taa tab tak tan tas tat tba tbb tbk tbn tbs tbt tka tkb tkk tks tkt tna tnb tnk tnn tns tnt tsa tsb tsk tsn tss tst tta ttb ttk ttn tts ttt