a-a a-b a-c aaa aab aac aaf aah aam ab- aba abb abc abf abh abm ac- aca acb acc acf ach acm af- afa afb afc aff afh afm aha ahb ahc ahf ahh ahm ama amb amc amf amh amm baa bab bac baf bah bam bba bbb bbc bbf bbh bbm bca bcb bcc bcf bch bcm bfa bfb bfc bff bfh bfm bha bhb bhc bhf bhh bhm bma bmb bmc bmf bmh bmm c-- caa cab cac caf cah cam cba cbb cbc cbf cbh cbm cca ccb ccc ccf cch ccm cfa cfb cfc cff cfh cfm ch- cha chb chc chf chh chm cma cmb cmc cmf cmh cmm faa fab fac faf fah fam fba fbb fbc fbf fbh fbm fca fcb fcc fcf fcm ffa ffc fff ffh ffm fha fhb fhc fhf fhh fhm fma fmb fmc fmf fmh fmm haa hab hac haf hah ham hba hbb hbc hbf hbh hbm hca hcb hcc hcf hch hcm hfa hfb hfc hff hfh hfm hha hhb hhc hhf hhh hhm hma hmb hmc hmf hmh hmm m-f maa mab mac maf mah mam mba mbb mbc mbf mbh mbm mc- mca mcb mcc mcf mch mcm mfa mfb mfc mff mfh mfm mha mhc mhf mhh mhm mma mmb mmc mmf mmh mmm