-ic a-a a-b a-c a-i aaa aab aac aae aai aam aax ab- aba abb abc abe abi abm abx ac- aca acb acc ace aci acm acx aea aeb aec aee aei aem aex ai- aia aib aic aie aii aim aix ama amb amc ame ami amm amx ax- axa axe axi axm axx baa bab bac bae bai bam bax bba bbb bbc bbe bbi bbm bbx bca bcb bcc bce bci bcm bcx be- bea beb bec bee bei bem bex bi- bia bib bic bie bii bim bix bma bmb bmc bme bmi bmm bmx bxb bxi bxm bxx c-- caa cab cac cae cai cam cax cba cbb cbc cbe cbi cbm cbx cca ccb ccc cce cci ccm ccx ce- cea ceb cec cee cei cem cex ci- cia cib cic cie cii cim cix cma cmb cmc cme cmi cmm cmx cxc cxi cxx eaa eab eac eae eai eam eax eba ebb ebc ebe ebi ebm ebx ec- eca ecb ecc ece eci ecm ecx eea eeb eec eee eem eex eia eib eic eie eii eim eix em- ema emb emc eme emi emm emx ex- exa exc exe exi exx ia- iaa iab iac iae iai iam iba ibb ibc ibe ibi ibm ibx ica icb icc ice ici icm ie- iea iec iee iei iem iex iia iib iic iie iii iim iix im- ima imb imc ime imi imm imx ixc ixe ixi maa mab mac mae mai mam max mba mbb mbc mbe mbi mbm mbx mc- mca mcb mcc mce mci mcm mcx mea meb mec mee mei mem mex mi- mia mib mic mie mii mim mix mma mmb mmc mme mmi mmm mmx mxa mxc mxi xaa xac xam xbc xbe xbx xcb xci xcx xee xem xex xia xic xie xii xix xma xmc xmi xmm xmx xxi xxx