-ey a-a a-b a-c aaa aab aac aae aam aao aay ab- aba abb abc abe abm abo aby ac- aca acb acc ace acm aco acy aea aeb aec aee aem aeo aey ama amb amc ame amm amo amy aoa aob aoc aoe aom aoo ay- aya ayc aye ayo baa bab bac bae bam bao bay bba bbb bbc bbe bbm bbo bby bca bcb bcc bce bcm bco bcy be- bea beb bec bee bem beo bey bma bmb bmc bme bmm bmo boa bob boc boe bom boo boy by- bya byc bye bym byo c-- caa cab cac cae cam cao cay cba cbb cbc cbe cbm cbo cby cca ccb ccc cce ccm cco ce- cea ceb cec cee cem ceo cey cma cmb cmc cme cmm cmo cmy co- coa cob coc coe com coo coy cya cyb cyc cye cym cyo eaa eab eac eae eam eao eba ebb ebc ebe ebm ebo eby ec- eca ecb ecc ece ecm eco eea eeb eec eee eem eeo eey em- ema emb emc eme emm emo eo- eoa eob eoc eoe eom eoo eya eyc eye eym eyo m-o maa mab mac mae mam mao may mba mbb mbc mbe mbm mbo mc- mca mcb mcc mce mcm mco mea meb mec mee mem meo mey mma mmb mmc mme mmm mmo moa mob moc moe mom moo moy my- mya myb myc mye mym myo oaa oab oac oae oam oao ob- oba obb obc obe obm obo oby oc- oca ocb occ ocm oco oea oeb oec oee oem oeo oey om- oma omb omc ome omm omo omy oo- ooa oob ooc oom ooo oya oye oyo yaa yab yac yae yam yao yay ybc ybe ybm yby yca ycc yce yco ycy yea yeb yec yee yem yeo yey yma ymc yme ymm ymo yob yoc yoe yom yoo yoy yyb yyc yye yyy