a-a a-b a-c aaa aab aac aah aam ab- aba abb abc abh abm ac- aca acb acc ach acm aha ahb ahc ahh ahm ama amb amc amh amm baa bab bac bah bam bba bbb bbc bbh bbm bca bcb bcc bch bcm bha bhb bhc bhh bhm bma bmb bmc bmh bmm c-- caa cab cac cah cam cba cbb cbc cbh cbm cca ccb ccc cch ccm ch- cha chb chc chh chm cma cmb cmc cmh cmm haa hab hac hah ham hba hbb hbc hbh hbm hca hcb hcc hch hcm hha hhb hhc hhh hhm hma hmb hmc hmh hmm maa mab mac mah mam mba mbb mbc mbh mbm mc- mca mcb mcc mch mcm mha mhc mhh mhm mma mmb mmc mmh mmm