-ic a-a a-b a-c a-i aaa aab aac aae aai aam aao ab- aba abb abc abe abi abm abo ac- aca acb acc ace aci acm aco aea aeb aec aee aei aem aeo ai- aia aib aic aie aii aim aio ama amb amc ame ami amm amo aoa aob aoc aoe aoi aom aoo baa bab bac bae bai bam bao bba bbb bbc bbe bbi bbm bbo bca bcb bcc bce bci bcm bco be- bea beb bec bee bei bem beo bi- bia bib bic bie bii bim bio bma bmb bmc bme bmi bmm bmo boa bob boc boe boi bom boo c-- caa cab cac cae cai cam cao cba cbb cbc cbe cbi cbm cbo cca ccb ccc cce cci ccm cco ce- cea ceb cec cee cei cem ceo ci- cia cib cic cie cii cim cio cma cmb cmc cme cmi cmm cmo co- coa cob coc coe coi com coo eaa eab eac eae eai eam eao eba ebb ebc ebe ebi ebm ebo ec- eca ecb ecc ece eci ecm eco eea eeb eec eee eem eeo eia eib eic eie eii eim eio em- ema emb emc eme emi emm emo eo- eoa eob eoc eoe eoi eom eoo ia- iaa iab iac iae iai iam iao iba ibb ibc ibe ibi ibm ibo ica icb icc ice ici icm ico ie- iea iec iee iei iem iia iib iic iie iii iim iio im- ima imb imc ime imi imm imo io- ioa iob ioc ioe ioi iom ioo m-o maa mab mac mae mai mam mao mba mbb mbc mbe mbi mbm mbo mc- mca mcb mcc mce mci mcm mco mea meb mec mee mei mem meo mi- mia mib mic mie mii mim mio mma mmb mmc mme mmi mmm mmo moa mob moc moe moi mom moo o-i oaa oab oac oae oai oam oao ob- oba obb obc obe obi obm obo oc- oca ocb occ oci ocm oco oea oeb oec oee oei oem oeo oia oib oic oie oii oim oio om- oma omb omc ome omi omm omo oo- ooa oob ooc ooi oom ooo