a-a a-b aaa aab aag aan aao aas aay ab- aba abb abg abn abo abs aby ag- aga agb agg agn ago ags agy an- ana anb ang ann ano ans any aoa aob aog aon aoo aos as- asa asb asg asn aso ass asy ay- aya ayn ayo ays baa bab bag ban bao bas bay bba bbb bbg bbn bbo bbs bby bga bgb bgg bgn bgo bgs bna bnb bng bnn bno bns boa bob bog bon boo bos boy bsa bsb bsg bsn bso bss bsy by- bya byg byn byo bys gaa gab gag gan gao gas gay gba gbg gbn gbo gbs gby gga ggb ggg ggn ggo ggs gna gnb gnn gno gns goa gob gog gon goo gos goy gsa gsb gsg gsn gso gss gy- gya gyb gyn gyo gys naa nab nag nan nao nas nay nba nbb nbg nbn nbo nbs nga ngb ngg ngn ngo ngs nna nnb nng nnn nno nns no- noa nob nog non noo nos noy nsa nsb nsg nsn nso nss nsy nya nyg nyn nyo nys nyy oaa oab oag oan oao oas ob- oba obb obg obn obo obs oby oga ogg ogn ogo ogs ogy on- ona onb ong onn ono ons ony oo- ooa oob oog oon ooo oos os- osa osb osg osn oso oss oya oyo oys saa sab sag san sao sas say sba sbb sbg sbn sbo sbs sby sga sgb sgg sgn sgo sgs sna snb sng snn sno sns sny soa sob sog son soo sos soy ss- ssa ssb ssg ssn sso sss sy- sya syb syg syn sys yaa yab yag yan yao yas yay ybg ybs yby yga ygo yna yng ynn yns yny yob yog yon yoo yos yoy ysa ysb ysg yso yss ysy yyb yyg yys yyy