a-a a-b a-z aaa aab aan aar aay aaz ab- aba abb abn abr aby abz an- ana anb ann anr any anz ar- ara arb arn arr ary arz ay- aya ayn ayr ayz az- aza azb azn azy azz baa bab ban bar bay baz bba bbb bbn bbr bby bna bnb bnn bnr bnz bra brb brn brr bry brz by- bya byn byr byz bza bzn bzr bzz naa nab nan nar nay naz nba nbb nbn nbr nna nnb nnn nnz nra nrb nrn nrr nry nrz nya nyn nyy nzb nzz ra- raa rab ran rar ray raz rba rbb rbn rbr rna rnb rnn rnr rny rnz rra rrb rrn rrr ry- rya ryn ryr ryy ryz rza rzb rzy yaa yab yan yar yay yaz ybr yby ybz yna ynn yny yra yrn yyb yyy yyz yzb yzr yzy zaa zab zan zar zay zaz zbb zbr zby znn zzr zzy zzz