a-a a-b a-c aaa aab aac aad aan aar aay ab- aba abb abc abd abn abr aby ac- aca acb acc acd acn acr acy ad- ada adb adc add adn adr ady an- ana anb anc and ann anr any ar- ara arb arc ard arn arr ary ay- aya ayc ayd ayn ayr baa bab bac bad ban bar bay bba bbb bbc bbd bbn bbr bby bca bcb bcc bcd bcn bcr bcy bda bdb bdc bdd bdr bdy bna bnb bnc bnd bnn bnr bra brb brd brn brr bry by- bya byc byd byn byr c-- caa cab cac cad can car cay cba cbb cbc cbd cbn cbr cby cca ccb ccc ccd ccn ccr cda cdb cdc cdd cdn cdr cdy cn- cna cnb cnc cnd cnn cnr cny cra crb crc crd crn crr cry cya cyb cyc cyd cyn cyr daa dab dac dad dan dar day dba dbb dbc dbd dbn dbr dby dca dcb dcc dcd dcn dcr dda ddb ddc ddd ddn ddr ddy dna dnb dnc dnd dnn dnr dny dra drb drc drd drn drr dry dy- dya dyb dyc dyd dyn dyr dyy naa nab nac nad nan nar nay nba nbb nbc nbd nbn nbr nca ncb ncc ncd ncn ncr nda ndb ndc ndd ndn ndr ndy nna nnb nnc nnn nra nrb nrc nrd nrn nrr nry nya nyc nyd nyn nyy ra- raa rab rac rad ran rar ray rba rbb rbc rbd rbn rbr rca rcb rcc rcd rcn rcr rda rdb rdc rdd rdn rdr rdy rna rnb rnc rnd rnn rnr rny rra rrb rrc rrd rrn rrr ry- rya ryc ryd ryn ryr ryy yaa yab yac yad yan yar yay ybc ybr yby yca ycc ycd ycy yda ydn ydy yna ynd ynn yny yra yrc yrn yyb yyc yyy