-ey a-a a-b a-c aaa aab aac aae aam aay ab- aba abb abc abe abm aby ac- aca acb acc ace acm acy aea aeb aec aee aem aey ama amb amc ame amm amy ay- aya ayc aye baa bab bac bae bam bay bba bbb bbc bbe bbm bby bca bcb bcc bce bcm bcy be- bea beb bec bee bem bey bma bmb bmc bme bmm by- bya byc bye bym c-- caa cab cac cae cam cay cba cbb cbc cbe cbm cby cca ccb ccc cce ccm ce- cea ceb cec cee cem cey cma cmb cmc cme cmm cmy cya cyb cyc cye cym eaa eab eac eae eam eba ebb ebc ebe ebm eby ec- eca ecb ecc ece ecm eea eeb eec eee eem eey em- ema emb emc eme emm eya eyc eye eym maa mab mac mae mam may mba mbb mbc mbe mbm mc- mca mcb mcc mce mcm mea meb mec mee mem mey mma mmb mmc mme mmm my- mya myb myc mye mym yaa yab yac yae yam yay ybc ybe ybm yby yca ycc yce ycy yea yeb yec yee yem yey yma ymc yme ymm yyb yyc yye yyy