a-a a-b a-c a-z aaa aab aac aah aao aar aaz ab- aba abb abc abh abo abr abz ac- aca acb acc ach aco acr acz aha ahb ahc ahh aho ahr ahz aoa aob aoc aoh aoo aor ar- ara arb arc arh aro arr arz az- aza azb azo azz baa bab bac bah bao bar baz bba bbb bbc bbh bbo bbr bca bcb bcc bch bco bcr bcz bha bhb bhc bhh bho bhr boa bob boc boh boo bor boz bra brb brh bro brr brz bza bzh bzo bzr bzz c-- caa cab cac cah cao car caz cba cbb cbc cbh cbo cbr cbz cca ccb ccc cch cco ccr ccz ch- cha chb chc chh cho chr chz co- coa cob coc coh coo cor coz cra crb crc crh cro crr crz cz- czc czo haa hab hac hah hao har haz hba hbb hbc hbh hbo hbr hbz hca hcb hcc hch hco hcr hha hhb hhc hhh hho hhr hhz hoa hob hoc hoh hoo hor hr- hra hrb hrc hrh hro hrr hrz hzo oaa oab oac oah oao oar ob- oba obb obc obh obo obr oc- oca ocb occ och oco ocr ocz oha ohc ohh oho ohr oo- ooa oob ooc ooh ooo oor or- ora orb orc orh oro orr orz oza ozo ozz ra- raa rab rac rah rao rar raz rba rbb rbc rbh rbo rbr rca rcb rcc rch rco rcr rh- rha rhb rhc rhh rho rhr roa rob roc roh roo ror roz rra rrb rrc rrh rrr rza rzb rzo zaa zab zac zah zao zar zaz zbb zbc zbr zco zha zhc zho zhr zo- zoa zob zoc zoo zor zrh zro zzr zzz