a-a a-b a-c aaa aab aac aae aah aam ab- aba abb abc abe abh abm ac- aca acb acc ace ach acm aea aeb aec aee aeh aem aha ahb ahc ahe ahh ahm ama amb amc ame amh amm baa bab bac bae bah bam bba bbb bbc bbe bbh bbm bca bcb bcc bce bch bcm be- bea beb bec bee beh bem bha bhb bhc bhe bhh bhm bma bmb bmc bme bmh bmm c-- caa cab cac cae cah cam cba cbb cbc cbe cbh cbm cca ccb ccc cce cch ccm ce- cea ceb cec cee ceh cem ch- cha chb chc che chh chm cma cmb cmc cme cmh cmm eaa eab eac eae eah eam eba ebb ebc ebe ebh ebm ec- eca ecb ecc ece ech ecm eea eeb eec eee eem eha ehb ehc ehe ehh ehm em- ema emb emc eme emh emm haa hab hac hae hah ham hba hbb hbc hbe hbh hbm hca hcb hcc hce hch hcm he- hea heb hec hee heh hem hha hhb hhc hhe hhh hhm hma hmb hmc hme hmh hmm maa mab mac mae mah mam mba mbb mbc mbe mbh mbm mc- mca mcb mcc mce mch mcm mea meb mec mee meh mem mha mhc mhh mhm mma mmb mmc mme mmh mmm