a-a a-b a-c aaa aab aac aag aah aan aar ab- aba abb abc abg abh abn abr ac- aca acb acc acg ach acn acr ag- aga agb agc agg agh agn agr aha ahb ahc ahg ahh ahn ahr an- ana anb anc ang anh ann anr ar- ara arb arc arg arh arn arr baa bab bac bag bah ban bar bba bbb bbc bbg bbh bbn bbr bca bcb bcc bcg bch bcn bcr bga bgb bgc bgg bgh bgn bgr bha bhb bhc bhg bhh bhr bna bnb bnc bng bnn bnr bra brb brg brh brn brr c-- caa cab cac cag cah can car cba cbb cbc cbg cbh cbn cbr cca ccb ccc ccg cch ccn ccr cga cgb cgc cgg cgh cgn cgr ch- cha chb chc chg chh chn chr cn- cna cnb cnc cng cnh cnn cnr cra crb crc crg crh crn crr gaa gab gac gag gah gan gar gba gbc gbg gbh gbn gbr gca gcb gcc gcg gch gcn gcr gga ggb ggc ggg ggh ggn ggr gha ghb ghc ghg ghh ghn ghr gna gnb gnc gnn gnr gra grb grc grg grh grn grr haa hab hac hag hah han har hba hbb hbc hbg hbh hbn hbr hca hcb hcc hcg hch hcn hcr hga hgb hgc hgg hgh hgn hgr hha hhb hhc hhg hhh hhn hhr hna hnb hnc hng hnh hnn hr- hra hrb hrc hrg hrh hrn hrr naa nab nac nag nah nan nar nba nbb nbc nbg nbn nbr nca ncb ncc ncg nch ncn ncr nga ngb ngc ngg ngh ngn nha nhb nhc nhg nhh nhn nhr nna nnb nnc nng nnh nnn nra nrb nrc nrg nrn nrr ra- raa rab rac rag rah ran rar rba rbb rbc rbg rbh rbn rbr rca rcb rcc rcg rch rcn rcr rga rgb rgc rgg rgh rgn rgr rh- rha rhb rhc rhg rhh rhn rhr rna rnb rnc rng rnh rnn rnr rra rrb rrc rrg rrh rrn rrr