a-a a-b a-c aaa aab aac aah aam aan ab- aba abb abc abh abm abn ac- aca acb acc ach acm acn aha ahb ahc ahh ahm ahn ama amb amc amh amm amn an- ana anb anc anh anm ann baa bab bac bah bam ban bba bbb bbc bbh bbm bbn bca bcb bcc bch bcm bcn bha bhb bhc bhh bhm bma bmb bmc bmh bmm bmn bna bnb bnc bnn c-- caa cab cac cah cam can cba cbb cbc cbh cbm cbn cca ccb ccc cch ccm ccn ch- cha chb chc chh chm chn cma cmb cmc cmh cmm cmn cn- cna cnb cnc cnh cnm cnn haa hab hac hah ham han hba hbb hbc hbh hbm hbn hca hcb hcc hch hcm hcn hha hhb hhc hhh hhm hhn hma hmb hmc hmh hmm hna hnb hnc hnh hnn maa mab mac mah mam man mba mbb mbc mbh mbm mc- mca mcb mcc mch mcm mcn mha mhc mhh mhm mhn mma mmb mmc mmh mmm mmn mna mnb mnc mnm mnn naa nab nac nah nam nan nba nbb nbc nbm nbn nca ncb ncc nch ncm ncn nha nhb nhc nhh nhm nhn nma nmb nmc nmh nmm nmn nna nnb nnc nnh nnm nnn