a-a a-b a-c a-t a-z aaa aab aac aar aas aat aay aaz ab- aba abb abc abr abs abt aby abz ac- aca acb acc acr acs act acy acz ar- ara arb arc arr ars art ary arz as- asa asb asc asr ass ast asy asz at- ata atb atc atr ats att atz ay- aya ayc ayr ays ayt ayz az- aza azb azs azt azy azz baa bab bac bar bas bat bay baz bba bbb bbc bbr bbs bbt bby bca bcb bcc bcr bcs bct bcy bcz bra brb brr brs brt bry brz bsa bsb bsc bsr bss bst bsy bta btb btc btr bts btt bty btz by- bya byc byr bys byt byz bza bzr bzs bzz c-- caa cab cac car cas cat cay caz cba cbb cbc cbr cbs cbt cby cbz cca ccb ccc ccr ccs cct ccz cra crb crc crr crs crt cry crz csa csb csc csr css cst csy csz cta ctb ctc ctr cts ctt cty ctz cya cyb cyc cyr cys cyt cz- czc czt ra- raa rab rac rar ras rat ray raz rba rbb rbc rbr rbs rbt rca rcb rcc rcr rcs rct rra rrb rrc rrr rrs rrt rsa rsb rsc rsr rss rst rta rtb rtc rtr rts rtt rty rtz ry- rya ryc ryr rys ryy ryz rza rzb rzy saa sab sac sar sas sat say saz sba sbb sbc sbr sbs sbt sby sca scb scc scr scs sct sr- sra srb src srr srs srt sry ss- ssa ssb ssc ssr sss sst ssz sta stb stc str sts stt sty stz sy- sya syb syc syr sys syt sza szr taa tab tac tar tas tat tay taz tba tbb tbc tbr tbs tbt tbz tca tcb tcc tcr tcs tct tra trb trc trr trs trt try trz tsa tsb tsc tsr tss tst tsy tta ttb ttc ttr tts ttt tty tya tyc tyr tys tyt tza tzs yaa yab yac yar yas yat yay yaz ybc ybr ybs yby ybz yca ycc ycs ycy yra yrc yrs yrt ysa ysb ysc ysr yss yst ysy ysz yta ytc ytr yts ytt yyb yyc yys yyt yyy yyz yzb yzr yzy zaa zab zac zar zas zat zay zaz zbb zbc zbr zbs zbt zby zcs zrs zsa zst zsz zta ztr zzr zzs zzt zzy zzz