a-a a-b aaa aab aad aan aao aas aay ab- aba abb abd abn abo abs aby ad- ada adb add adn ado ads ady an- ana anb and ann ano ans any aoa aob aod aon aoo aos as- asa asb asd asn aso ass asy ay- aya ayd ayn ayo ays baa bab bad ban bao bas bay bba bbb bbd bbn bbo bbs bby bda bdb bdd bdo bds bdy bna bnb bnd bnn bno bns boa bob bod bon boo bos boy bsa bsb bsd bsn bso bss bsy by- bya byd byn byo bys daa dab dad dan dao das day dba dbb dbd dbn dbo dbs dby dda ddb ddd ddn ddo dds ddy dna dnb dnd dnn dno dns dny doa dob dod don doo dos doy dsa dsb dsd dsn dso dss dsy dy- dya dyb dyd dyn dyo dys dyy naa nab nad nan nao nas nay nba nbb nbd nbn nbo nbs nda ndb ndd ndn ndo nds ndy nna nnb nnn nno nns no- noa nob nod non noo nos noy nsa nsb nsd nsn nso nss nsy nya nyd nyn nyo nys nyy oaa oab oad oan oao oas ob- oba obb obd obn obo obs oby oda odb odd odn odo ods on- ona onb ond onn ono ons ony oo- ooa oob ood oon ooo oos os- osa osb osd osn oso oss oya oyd oyo oys saa sab sad san sao sas say sba sbb sbd sbn sbo sbs sby sda sdb sdd sdn sdo sds sdy sna snb snd snn sno sns sny soa sob sod son soo sos soy ss- ssa ssb ssd ssn sso sss sy- sya syb syd syn sys yaa yab yad yan yao yas yay ybs yby yda ydn ydo yds ydy yna ynd ynn yns yny yob yod yon yoo yos yoy ysa ysb yso yss ysy yyb yys yyy