a-a a-b a-z aaa aab aad aan aay aaz ab- aba abb abd abn aby abz ad- ada adb add adn ady adz an- ana anb and ann any anz ay- aya ayd ayn ayz az- aza azb azd azn azy azz baa bab bad ban bay baz bba bbb bbd bbn bby bda bdb bdd bdy bdz bna bnb bnd bnn bnz by- bya byd byn byz bza bzd bzn bzz daa dab dad dan day daz dba dbb dbd dbn dby dbz dda ddb ddd ddn ddy ddz dna dnb dnd dnn dny dnz dy- dya dyb dyd dyn dyy dza dzb dzd naa nab nad nan nay naz nba nbb nbd nbn nda ndb ndd ndn ndy nna nnb nnn nnz nya nyd nyn nyy nzb nzd nzz yaa yab yad yan yay yaz yby ybz yda ydn ydy yna ynd ynn yny yyb yyy yyz yzb yzy zaa zab zad zan zay zaz zbb zby znd znn zzy zzz