a-a a-b aaa aab aad aak aam aan ab- aba abb abd abk abm abn ad- ada adb add adk adm adn aka akb akd akk akm akn ama amb amd amk amm amn an- ana anb and ank anm ann baa bab bad bak bam ban bba bbb bbd bbk bbm bbn bda bdb bdd bdk bdm bka bkb bkk bkm bkn bma bmb bmd bmk bmm bmn bna bnb bnd bnk bnn daa dab dad dak dam dan dba dbb dbd dbk dbm dbn dda ddb ddd ddk ddm ddn dka dkb dkk dkm dma dmb dmd dmk dmm dmn dna dnb dnd dnk dnm dnn ka- kaa kab kad kak kam kan kba kbb kbd kbk kbm kbn kda kdb kdk kdm kkb kkk kkm kkn kma kmb kmd kmk kmm kn- kna knd knk knm knn maa mab mad mak mam man mba mbb mbd mbk mbm mda mdb mdd mdk mdm mdn mka mkb mkd mkk mkm mkn mma mmb mmd mmk mmm mmn mna mnb mnk mnm mnn naa nab nad nak nam nan nba nbb nbd nbk nbm nbn nda ndb ndd ndk ndm ndn nka nkk nkm nkn nma nmb nmd nmk nmm nmn nna nnb nnk nnm nnn