a-a a-b aaa aab aad aak aan aay ab- aba abb abd abk abn aby ad- ada adb add adk adn ady aka akb akd akk akn an- ana anb and ank ann any ay- aya ayd ayk ayn baa bab bad bak ban bay bba bbb bbd bbk bbn bby bda bdb bdd bdk bdy bka bkb bkk bkn bna bnb bnd bnk bnn by- bya byd byk byn daa dab dad dak dan day dba dbb dbd dbk dbn dby dda ddb ddd ddk ddn ddy dka dkb dkk dna dnb dnd dnk dnn dny dy- dya dyb dyd dyk dyn dyy ka- kaa kab kad kak kan kay kba kbb kbd kbk kbn kda kdb kdk kdy kkb kkk kkn kky kn- kna knd knk knn kya kyd kyn naa nab nad nak nan nay nba nbb nbd nbk nbn nda ndb ndd ndk ndn ndy nka nkk nkn nky nna nnb nnk nnn nya nyd nyk nyn nyy yaa yab yad yak yan yay yby yda ydn ydy yka ykk ykn yna ynd ynk ynn yny yyb yyy