a-a a-b a-t aaa aab aad aan aas aat aay ab- aba abb abd abn abs abt aby ad- ada adb add adn ads adt ady an- ana anb and ann ans ant any as- asa asb asd asn ass ast asy at- ata atb atd atn ats att ay- aya ayd ayn ays ayt baa bab bad ban bas bat bay bba bbb bbd bbn bbs bbt bby bda bdb bdd bds bdt bdy bna bnb bnd bnn bns bnt bsa bsb bsd bsn bss bst bsy bta btb btd btn bts btt bty by- bya byd byn bys byt daa dab dad dan das dat day dba dbb dbd dbn dbs dbt dby dda ddb ddd ddn dds ddt ddy dna dnb dnd dnn dns dnt dny dsa dsb dsd dsn dss dst dsy dta dtb dtd dtn dts dtt dty dy- dya dyb dyd dyn dys dyy naa nab nad nan nas nat nay nba nbb nbd nbn nbs nbt nda ndb ndd ndn nds ndt ndy nna nnb nnn nns nnt nsa nsb nsd nsn nss nst nsy nta ntb ntd ntn nts ntt nya nyd nyn nys nyt nyy saa sab sad san sas sat say sba sbb sbd sbn sbs sbt sby sda sdb sdd sdn sds sdt sdy sna snb snd snn sns snt sny ss- ssa ssb ssd ssn sss sst sta stb std stn sts stt sty sy- sya syb syd syn sys syt taa tab tad tan tas tat tay tba tbb tbd tbn tbs tbt tda tdb tdd tdn tds tdt tdy tna tnb tnd tnn tns tnt tsa tsb tsd tsn tss tst tsy tta ttb ttd ttn tts ttt tty tya tyd tyn tys tyt yaa yab yad yan yas yat yay ybs yby yda ydn yds ydt ydy yna ynd ynn yns yny ysa ysb yss yst ysy yta ytd ytn yts ytt yyb yys yyt yyy