a-a a-b a-i a-t a-z aaa aab aai aas aat aaz ab- aba abb abi abs abt abz ai- aia aib aii ais ait aiz as- asa asb asi ass ast asz at- ata atb ati ats att atz az- aza azb azi azs azt azz baa bab bai bas bat baz bba bbb bbi bbs bbt bi- bia bib bii bis bit biz bsa bsb bsi bss bst bta btb bti bts btt btz bza bzs bzz ia- iaa iab iai ias iat iaz iba ibb ibi ibs ibt ibz iia iib iii iis iit is- isa isb isi iss ist ita itb iti its itt itz iza izi izz saa sab sai sas sat saz sba sbb sbi sbs sbt sia sib sii sis sit ss- ssa ssb ssi sss sst ssz sta stb sti sts stt stz sza szi taa tab tai tas tat taz tba tbb tbi tbs tbt tbz tia tib tii tis tit tiz tsa tsb tsi tss tst tta ttb tti tts ttt tza tzs zaa zab zai zas zat zaz zbb zbs zbt zia zib zis zit ziz zsa zsi zst zsz zta zzs zzt zzz