a-a a-b aaa aab aag aah aan aao aas ab- aba abb abg abh abn abo abs ag- aga agb agg agh agn ago ags aha ahb ahg ahh ahn aho ahs an- ana anb ang anh ann ano ans aoa aob aog aoh aon aoo aos as- asa asb asg ash asn aso ass baa bab bag bah ban bao bas bba bbb bbg bbh bbn bbo bbs bga bgb bgg bgh bgn bgo bgs bha bhb bhg bhh bho bhs bna bnb bng bnn bno bns boa bob bog boh bon boo bos bsa bsb bsg bsh bsn bso bss gaa gab gag gah gan gao gas gba gbg gbh gbn gbo gbs gga ggb ggg ggh ggn ggo ggs gha ghb ghg ghh ghn gho ghs gna gnb gnn gno gns goa gob gog goh gon goo gos gsa gsb gsg gsn gso gss haa hab hag hah han hao has hba hbb hbg hbh hbn hbo hbs hga hgb hgg hgh hgn hgo hgs hha hhb hhg hhh hhn hho hhs hna hnb hng hnh hnn hno hns hoa hob hog hoh hon hoo hos hsa hsb hsg hsh hsn hss naa nab nag nah nan nao nas nba nbb nbg nbn nbo nbs nga ngb ngg ngh ngn ngo ngs nha nhb nhg nhh nhn nhs nna nnb nng nnh nnn nno nns no- noa nob nog noh non noo nos nsa nsb nsg nsh nsn nso nss oaa oab oag oah oan oao oas ob- oba obb obg obh obn obo obs oga ogg ogh ogn ogo ogs oha ohg ohh ohn oho ohs on- ona onb ong onh onn ono ons oo- ooa oob oog ooh oon ooo oos os- osa osb osg osh osn oso oss saa sab sag sah san sao sas sba sbb sbg sbh sbn sbo sbs sga sgb sgg sgh sgn sgo sgs sh- sha shb shg shh shn sho shs sna snb sng snn sno sns soa sob sog soh son soo sos ss- ssa ssb ssg ssh ssn sso sss