a-a a-b a-t a-z aaa aab aae aak aas aat aaz ab- aba abb abe abk abs abt abz aea aeb aee aek aes aet aez aka akb ake akk aks as- asa asb ase ask ass ast asz at- ata atb ate ats att atz az- aza azb aze azs azt azz baa bab bae bak bas bat baz bba bbb bbe bbk bbs bbt be- bea beb bee bek bes bet bez bka bkb bke bkk bks bkt bsa bsb bse bsk bss bst bta btb bte btk bts btt btz bza bze bzs bzz eaa eab eae eak eas eat eaz eba ebb ebe ebk ebs ebt eea eeb eee eek ees eet eka ekb eke eks ekt es- esa esb ese esk ess est eta etb ete etk ets ett etz eze ezs ezz k-t k-z ka- kaa kab kae kak kas kat kaz kba kbb kbe kbk kbs kbz ke- kea keb kee kek kes ket kez kkb kke kkk kks kkt ksa ksb kse ksk kss kst kta ktb kte ktk kts ktt saa sab sae sak sas sat saz sba sbb sbe sbk sbs sbt se- sea seb see sek ses set sez sk- ska skb ske skk sks skt ss- ssa ssb sse ssk sss sst ssz sta stb ste stk sts stt stz sza sze taa tab tae tak tas tat taz tba tbb tbe tbk tbs tbt tbz te- tea teb tee tek tes tet tez tka tkb tke tkk tks tkt tkz tsa tsb tse tsk tss tst tta ttb tte ttk tts ttt tza tze tzs zaa zab zak zas zat zaz zbb zbs zbt zea zeb zee zek zes zet zez zka zks zsa zse zst zsz zta zte zzs zzt zzz