-ic a-a a-b a-c a-i aaa aab aac aae aai aam ab- aba abb abc abe abi abm ac- aca acb acc ace aci acm aea aeb aec aee aei aem ai- aia aib aic aie aii aim ama amb amc ame ami amm baa bab bac bae bai bam bba bbb bbc bbe bbi bbm bca bcb bcc bce bci bcm be- bea beb bec bee bei bem bi- bia bib bic bie bii bim bma bmb bmc bme bmi bmm c-- caa cab cac cae cai cam cba cbb cbc cbe cbi cbm cca ccb ccc cce cci ccm ce- cea ceb cec cee cei cem ci- cia cib cic cie cii cim cma cmb cmc cme cmi cmm eaa eab eac eae eai eam eba ebb ebc ebe ebi ebm ec- eca ecb ecc ece eci ecm eea eeb eec eee eem eia eib eic eie eii eim em- ema emb emc eme emi emm ia- iaa iab iac iae iai iam iba ibb ibc ibe ibi ibm ica icb icc ice ici icm ie- iea iec iee iei iem iia iib iic iie iii iim im- ima imb imc ime imi imm maa mab mac mae mai mam mba mbb mbc mbe mbi mbm mc- mca mcb mcc mce mci mcm mea meb mec mee mei mem mi- mia mib mic mie mii mim mma mmb mmc mme mmi mmm