a-a a-b a-i aaa aab aae aai aam aao aax ab- aba abb abe abi abm abo abx aea aeb aee aei aem aeo aex ai- aia aib aie aii aim aio aix ama amb ame ami amm amo amx aoa aob aoe aoi aom aoo aox ax- axa axe axi axm axo axx baa bab bae bai bam bao bax bba bbb bbe bbi bbm bbo bbx be- bea beb bee bei bem beo bex bi- bia bib bie bii bim bio bix bma bmb bme bmi bmm bmo bmx boa bob boe boi bom boo box bxb bxi bxm bxo bxx eaa eab eae eai eam eao eax eba ebb ebe ebi ebm ebo ebx eea eeb eee eem eeo eex eia eib eie eii eim eio eix em- ema emb eme emi emm emo emx eo- eoa eob eoe eoi eom eoo ex- exa exe exi exo exx ia- iaa iab iae iai iam iao iba ibb ibe ibi ibm ibo ibx ie- iea iee iei iem iex iia iib iie iii iim iio iix im- ima imb ime imi imm imo imx io- ioa iob ioe ioi iom ioo ixe ixi m-o maa mab mae mai mam mao max mba mbb mbe mbi mbm mbo mbx mea meb mee mei mem meo mex mi- mia mib mie mii mim mio mix mma mmb mme mmi mmm mmo mmx moa mob moe moi mom moo mox mxa mxi o-i oaa oab oae oai oam oao oax ob- oba obb obe obi obm obo obx oea oeb oee oei oem oeo oex oia oib oie oii oim oio om- oma omb ome omi omm omo omx oo- ooa oob ooi oom ooo oox ox- oxa oxb oxi oxo oxx xaa xam xbe xbx xee xem xex xia xie xii xio xix xma xmi xmm xmo xmx xoa xoi xom xoo xox xxi xxo xxx