a-a a-b a-c aaa aab aac aae aam aao ab- aba abb abc abe abm abo ac- aca acb acc ace acm aco aea aeb aec aee aem aeo ama amb amc ame amm amo aoa aob aoc aoe aom aoo baa bab bac bae bam bao bba bbb bbc bbe bbm bbo bca bcb bcc bce bcm bco be- bea beb bec bee bem beo bma bmb bmc bme bmm bmo boa bob boc boe bom boo c-- caa cab cac cae cam cao cba cbb cbc cbe cbm cbo cca ccb ccc cce ccm cco ce- cea ceb cec cee cem ceo cma cmb cmc cme cmm cmo co- coa cob coc coe com coo eaa eab eac eae eam eao eba ebb ebc ebe ebm ebo ec- eca ecb ecc ece ecm eco eea eeb eec eee eem eeo em- ema emb emc eme emm emo eo- eoa eob eoc eoe eom eoo m-o maa mab mac mae mam mao mba mbb mbc mbe mbm mbo mc- mca mcb mcc mce mcm mco mea meb mec mee mem meo mma mmb mmc mme mmm mmo moa mob moc moe mom moo oaa oab oac oae oam oao ob- oba obb obc obe obm obo oc- oca ocb occ ocm oco oea oeb oec oee oem oeo om- oma omb omc ome omm omo oo- ooa oob ooc oom ooo