a-a a-b a-t aaa aab aae aak aan aas aat ab- aba abb abe abk abn abs abt aea aeb aee aek aen aes aet aka akb ake akk akn aks an- ana anb ane ank ann ans ant as- asa asb ase ask asn ass ast at- ata atb ate atn ats att baa bab bae bak ban bas bat bba bbb bbe bbk bbn bbs bbt be- bea beb bee bek ben bes bet bka bkb bke bkk bkn bks bkt bna bnb bne bnk bnn bns bnt bsa bsb bse bsk bsn bss bst bta btb bte btk btn bts btt eaa eab eae eak ean eas eat eba ebb ebe ebk ebn ebs ebt eea eeb eee eek een ees eet eka ekb eke eks ekt en- ena enb ene enk enn ens ent es- esa esb ese esk esn ess est eta etb ete etk etn ets ett k-t ka- kaa kab kae kak kan kas kat kba kbb kbe kbk kbn kbs ke- kea keb kee kek ken kes ket kkb kke kkk kkn kks kkt kn- kna kne knk knn knt ksa ksb kse ksk ksn kss kst kta ktb kte ktk ktn kts ktt naa nab nae nak nan nas nat nba nbb nbe nbk nbn nbs nbt ne- nea neb nee nek nen nes net nka nke nkk nkn nks nkt nna nnb nne nnk nnn nns nnt nsa nsb nse nsk nsn nss nst nta ntb nte ntk ntn nts ntt saa sab sae sak san sas sat sba sbb sbe sbk sbn sbs sbt se- sea seb see sek sen ses set sk- ska skb ske skk sks skt sna snb sne snk snn sns snt ss- ssa ssb sse ssk ssn sss sst sta stb ste stk stn sts stt taa tab tae tak tan tas tat tba tbb tbe tbk tbn tbs tbt te- tea teb tee tek ten tes tet tka tkb tke tkk tks tkt tna tnb tne tnk tnn tns tnt tsa tsb tse tsk tsn tss tst tta ttb tte ttk ttn tts ttt