a-a a-b a-i aaa aab aai aam aax ab- aba abb abi abm abx ai- aia aib aii aim aix ama amb ami amm amx ax- axa axi axm axx baa bab bai bam bax bba bbb bbi bbm bbx bi- bia bib bii bim bix bma bmb bmi bmm bmx bxb bxi bxm bxx ia- iaa iab iai iam iba ibb ibi ibm ibx iia iib iii iim iix im- ima imb imi imm imx ixi maa mab mai mam max mba mbb mbi mbm mbx mi- mia mib mii mim mix mma mmb mmi mmm mmx mxa mxi xaa xam xbx xia xii xix xma xmi xmm xmx xxi xxx