a-a a-b aaa aab aad aan aas aay ab- aba abb abd abn abs aby ad- ada adb add adn ads ady an- ana anb and ann ans any as- asa asb asd asn ass asy ay- aya ayd ayn ays baa bab bad ban bas bay bba bbb bbd bbn bbs bby bda bdb bdd bds bdy bna bnb bnd bnn bns bsa bsb bsd bsn bss bsy by- bya byd byn bys daa dab dad dan das day dba dbb dbd dbn dbs dby dda ddb ddd ddn dds ddy dna dnb dnd dnn dns dny dsa dsb dsd dsn dss dsy dy- dya dyb dyd dyn dys dyy naa nab nad nan nas nay nba nbb nbd nbn nbs nda ndb ndd ndn nds ndy nna nnb nnn nns nsa nsb nsd nsn nss nsy nya nyd nyn nys nyy saa sab sad san sas say sba sbb sbd sbn sbs sby sda sdb sdd sdn sds sdy sna snb snd snn sns sny ss- ssa ssb ssd ssn sss sy- sya syb syd syn sys yaa yab yad yan yas yay ybs yby yda ydn yds ydy yna ynd ynn yns yny ysa ysb yss ysy yyb yys yyy