a-a a-b a-c aaa aab aac aah aam aar ab- aba abb abc abh abm abr ac- aca acb acc ach acm acr aha ahb ahc ahh ahm ahr ama amb amc amh amm amr ar- ara arb arc arh arm arr baa bab bac bah bam bar bba bbb bbc bbh bbm bbr bca bcb bcc bch bcm bcr bha bhb bhc bhh bhm bhr bma bmb bmc bmh bmm bmr bra brb brh brm brr c-- caa cab cac cah cam car cba cbb cbc cbh cbm cbr cca ccb ccc cch ccm ccr ch- cha chb chc chh chm chr cma cmb cmc cmh cmm cmr cra crb crc crh crm crr haa hab hac hah ham har hba hbb hbc hbh hbm hbr hca hcb hcc hch hcm hcr hha hhb hhc hhh hhm hhr hma hmb hmc hmh hmm hmr hr- hra hrb hrc hrh hrm hrr m-r maa mab mac mah mam mar mba mbb mbc mbh mbm mbr mc- mca mcb mcc mch mcm mcr mha mhc mhh mhm mhr mma mmb mmc mmh mmm mmr mra mrb mrc mrh mrm mrr ra- raa rab rac rah ram rar rba rbb rbc rbh rbm rbr rca rcb rcc rch rcm rcr rh- rha rhb rhc rhh rhm rhr rma rmb rmc rmh rmm rmr rra rrb rrc rrh rrm rrr