a-a a-b a-c aaa aab aac aah aam aan aar ab- aba abb abc abh abm abn abr ac- aca acb acc ach acm acn acr aha ahb ahc ahh ahm ahn ahr ama amb amc amh amm amn amr an- ana anb anc anh anm ann anr ar- ara arb arc arh arm arn arr baa bab bac bah bam ban bar bba bbb bbc bbh bbm bbn bbr bca bcb bcc bch bcm bcn bcr bha bhb bhc bhh bhm bhr bma bmb bmc bmh bmm bmn bmr bna bnb bnc bnn bnr bra brb brh brm brn brr c-- caa cab cac cah cam can car cba cbb cbc cbh cbm cbn cbr cca ccb ccc cch ccm ccn ccr ch- cha chb chc chh chm chn chr cma cmb cmc cmh cmm cmn cmr cn- cna cnb cnc cnh cnm cnn cnr cra crb crc crh crm crn crr haa hab hac hah ham han har hba hbb hbc hbh hbm hbn hbr hca hcb hcc hch hcm hcn hcr hha hhb hhc hhh hhm hhn hhr hma hmb hmc hmh hmm hmr hna hnb hnc hnh hnn hr- hra hrb hrc hrh hrm hrn hrr m-r maa mab mac mah mam man mar mba mbb mbc mbh mbm mbr mc- mca mcb mcc mch mcm mcn mcr mha mhc mhh mhm mhn mhr mma mmb mmc mmh mmm mmn mmr mna mnb mnc mnm mnn mnr mra mrb mrc mrh mrm mrn mrr naa nab nac nah nam nan nar nba nbb nbc nbm nbn nbr nca ncb ncc nch ncm ncn ncr nha nhb nhc nhh nhm nhn nhr nma nmb nmc nmh nmm nmn nmr nna nnb nnc nnh nnm nnn nra nrb nrc nrm nrn nrr ra- raa rab rac rah ram ran rar rba rbb rbc rbh rbm rbn rbr rca rcb rcc rch rcm rcn rcr rh- rha rhb rhc rhh rhm rhn rhr rma rmb rmc rmh rmm rmn rmr rna rnb rnc rnh rnm rnn rnr rra rrb rrc rrh rrm rrn rrr