a-a a-b a-c aaa aab aac aag aan aar aay ab- aba abb abc abg abn abr aby ac- aca acb acc acg acn acr acy ag- aga agb agc agg agn agr agy an- ana anb anc ang ann anr any ar- ara arb arc arg arn arr ary ay- aya ayc ayn ayr baa bab bac bag ban bar bay bba bbb bbc bbg bbn bbr bby bca bcb bcc bcg bcn bcr bcy bga bgb bgc bgg bgn bgr bna bnb bnc bng bnn bnr bra brb brg brn brr bry by- bya byc byg byn byr c-- caa cab cac cag can car cay cba cbb cbc cbg cbn cbr cby cca ccb ccc ccg ccn ccr cga cgb cgc cgg cgn cgr cgy cn- cna cnb cnc cng cnn cnr cny cra crb crc crg crn crr cry cya cyb cyc cyg cyn cyr gaa gab gac gag gan gar gay gba gbc gbg gbn gbr gby gca gcb gcc gcg gcn gcr gga ggb ggc ggg ggn ggr gna gnb gnc gnn gnr gra grb grc grg grn grr gry gy- gya gyb gyn gyr naa nab nac nag nan nar nay nba nbb nbc nbg nbn nbr nca ncb ncc ncg ncn ncr nga ngb ngc ngg ngn nna nnb nnc nng nnn nra nrb nrc nrg nrn nrr nry nya nyc nyg nyn nyy ra- raa rab rac rag ran rar ray rba rbb rbc rbg rbn rbr rca rcb rcc rcg rcn rcr rga rgb rgc rgg rgn rgr rna rnb rnc rng rnn rnr rny rra rrb rrc rrg rrn rrr ry- rya ryc ryg ryn ryr ryy yaa yab yac yag yan yar yay ybc ybg ybr yby yca ycc ycy yga ygc yna yng ynn yny yra yrc yrg yrn yyb yyc yyg yyy