a-a a-b a-c aaa aab aac aag aah aan aas ab- aba abb abc abg abh abn abs ac- aca acb acc acg ach acn acs ag- aga agb agc agg agh agn ags aha ahb ahc ahg ahh ahn ahs an- ana anb anc ang anh ann ans as- asa asb asc asg ash asn ass baa bab bac bag bah ban bas bba bbb bbc bbg bbh bbn bbs bca bcb bcc bcg bch bcn bcs bga bgb bgc bgg bgh bgn bgs bha bhb bhc bhg bhh bhs bna bnb bnc bng bnn bns bsa bsb bsc bsg bsh bsn bss c-- caa cab cac cag cah can cas cba cbb cbc cbg cbh cbn cbs cca ccb ccc ccg cch ccn ccs cga cgb cgc cgg cgh cgn cgs ch- cha chb chc chg chh chn chs cn- cna cnb cnc cng cnh cnn cns csa csb csc csg csh csn css gaa gab gac gag gah gan gas gba gbc gbg gbh gbn gbs gca gcb gcc gcg gch gcn gcs gga ggb ggc ggg ggh ggn ggs gha ghb ghc ghg ghh ghn ghs gna gnb gnc gnn gns gsa gsb gsc gsg gsn gss haa hab hac hag hah han has hba hbb hbc hbg hbh hbn hbs hca hcb hcc hcg hch hcn hcs hga hgb hgc hgg hgh hgn hgs hha hhb hhc hhg hhh hhn hhs hna hnb hnc hng hnh hnn hns hsa hsb hsc hsg hsh hsn hss naa nab nac nag nah nan nas nba nbb nbc nbg nbn nbs nca ncb ncc ncg nch ncn ncs nga ngb ngc ngg ngh ngn ngs nha nhb nhc nhg nhh nhn nhs nna nnb nnc nng nnh nnn nns nsa nsb nsc nsg nsh nsn nss saa sab sac sag sah san sas sba sbb sbc sbg sbh sbn sbs sca scb scc scg sch scn scs sga sgb sgc sgg sgh sgn sgs sh- sha shb shc shg shh shn shs sna snb snc sng snn sns ss- ssa ssb ssc ssg ssh ssn sss