a-a a-b a-i aaa aab aae aai aam aao ab- aba abb abe abi abm abo aea aeb aee aei aem aeo ai- aia aib aie aii aim aio ama amb ame ami amm amo aoa aob aoe aoi aom aoo baa bab bae bai bam bao bba bbb bbe bbi bbm bbo be- bea beb bee bei bem beo bi- bia bib bie bii bim bio bma bmb bme bmi bmm bmo boa bob boe boi bom boo eaa eab eae eai eam eao eba ebb ebe ebi ebm ebo eea eeb eee eem eeo eia eib eie eii eim eio em- ema emb eme emi emm emo eo- eoa eob eoe eoi eom eoo ia- iaa iab iae iai iam iao iba ibb ibe ibi ibm ibo ie- iea iee iei iem iia iib iie iii iim iio im- ima imb ime imi imm imo io- ioa iob ioe ioi iom ioo m-o maa mab mae mai mam mao mba mbb mbe mbi mbm mbo mea meb mee mei mem meo mi- mia mib mie mii mim mio mma mmb mme mmi mmm mmo moa mob moe moi mom moo o-i oaa oab oae oai oam oao ob- oba obb obe obi obm obo oea oeb oee oei oem oeo oia oib oie oii oim oio om- oma omb ome omi omm omo oo- ooa oob ooi oom ooo