-ic a-a a-b a-c a-i aaa aab aac aai aam aao ab- aba abb abc abi abm abo ac- aca acb acc aci acm aco ai- aia aib aic aii aim aio ama amb amc ami amm amo aoa aob aoc aoi aom aoo baa bab bac bai bam bao bba bbb bbc bbi bbm bbo bca bcb bcc bci bcm bco bi- bia bib bic bii bim bio bma bmb bmc bmi bmm bmo boa bob boc boi bom boo c-- caa cab cac cai cam cao cba cbb cbc cbi cbm cbo cca ccb ccc cci ccm cco ci- cia cib cic cii cim cio cma cmb cmc cmi cmm cmo co- coa cob coc coi com coo ia- iaa iab iac iai iam iao iba ibb ibc ibi ibm ibo ica icb icc ici icm ico iia iib iic iii iim iio im- ima imb imc imi imm imo io- ioa iob ioc ioi iom ioo m-o maa mab mac mai mam mao mba mbb mbc mbi mbm mbo mc- mca mcb mcc mci mcm mco mi- mia mib mic mii mim mio mma mmb mmc mmi mmm mmo moa mob moc moi mom moo o-i oaa oab oac oai oam oao ob- oba obb obc obi obm obo oc- oca ocb occ oci ocm oco oia oib oic oii oim oio om- oma omb omc omi omm omo oo- ooa oob ooc ooi oom ooo