a-a a-b a-c aaa aab aac aae aam aax ab- aba abb abc abe abm abx ac- aca acb acc ace acm acx aea aeb aec aee aem aex ama amb amc ame amm amx ax- axa axe axm axx baa bab bac bae bam bax bba bbb bbc bbe bbm bbx bca bcb bcc bce bcm bcx be- bea beb bec bee bem bex bma bmb bmc bme bmm bmx bxb bxm bxx c-- caa cab cac cae cam cax cba cbb cbc cbe cbm cbx cca ccb ccc cce ccm ccx ce- cea ceb cec cee cem cex cma cmb cmc cme cmm cmx cxc cxx eaa eab eac eae eam eax eba ebb ebc ebe ebm ebx ec- eca ecb ecc ece ecm ecx eea eeb eec eee eem eex em- ema emb emc eme emm emx ex- exa exc exe exx maa mab mac mae mam max mba mbb mbc mbe mbm mbx mc- mca mcb mcc mce mcm mcx mea meb mec mee mem mex mma mmb mmc mme mmm mmx mxa mxc xaa xac xam xbc xbe xbx xcb xcx xee xem xex xma xmc xmm xmx xxx