a-a a-b a-t a-z aaa aab aao aar aas aat aay aaz ab- aba abb abo abr abs abt aby abz aoa aob aoo aor aos aot ar- ara arb aro arr ars art ary arz as- asa asb aso asr ass ast asy asz at- ata atb ato atr ats att atz ay- aya ayo ayr ays ayt ayz az- aza azb azo azs azt azy azz baa bab bao bar bas bat bay baz bba bbb bbo bbr bbs bbt bby boa bob boo bor bos bot boy boz bra brb bro brr brs brt bry brz bsa bsb bso bsr bss bst bsy bta btb bto btr bts btt bty btz by- bya byo byr bys byt byz bza bzo bzr bzs bzz oaa oab oao oar oas oat ob- oba obb obo obr obs obt oby oo- ooa oob ooo oor oos oot or- ora orb oro orr ors ort ory orz os- osa osb oso osr oss ost ot- ota otb oto otr ots ott otz oya oyo oys oza ozo ozs ozt ozz ra- raa rab rao rar ras rat ray raz rba rbb rbo rbr rbs rbt roa rob roo ror ros rot roy roz rra rrb rrr rrs rrt rsa rsb rso rsr rss rst rta rtb rto rtr rts rtt rty rtz ry- rya ryo ryr rys ryy ryz rza rzb rzo rzy saa sab sao sar sas sat say saz sba sbb sbo sbr sbs sbt sby soa sob soo sor sos sot soy soz sr- sra srb sro srr srs srt sry ss- ssa ssb sso ssr sss sst ssz sta stb sto str sts stt sty stz sy- sya syb syr sys syt sza szr taa tab tao tar tas tat tay taz tba tbb tbo tbr tbs tbt tbz to- toa tob too tor tos tot toy toz tra trb tro trr trs trt try trz tsa tsb tso tsr tss tst tsy tta ttb tto ttr tts ttt tty tya tyo tyr tys tyt tza tzs yaa yab yao yar yas yat yay yaz ybr ybs yby ybz yob yoo yor yos yot yoy yra yro yrs yrt ysa ysb yso ysr yss yst ysy ysz yta yto ytr yts ytt yyb yys yyt yyy yyz yzb yzr yzy zaa zab zao zar zas zat zay zaz zbb zbr zbs zbt zby zo- zoa zob zoo zor zos zot zro zrs zsa zst zsz zta ztr zzr zzs zzt zzy zzz