a-a a-b a-i aaa aab aai aam aan aao ab- aba abb abi abm abn abo ai- aia aib aii aim ain aio ama amb ami amm amn amo an- ana anb ani anm ann ano aoa aob aoi aom aon aoo baa bab bai bam ban bao bba bbb bbi bbm bbn bbo bi- bia bib bii bim bin bio bma bmb bmi bmm bmn bmo bna bnb bni bnn bno boa bob boi bom bon boo ia- iaa iab iai iam ian iao iba ibb ibi ibm ibn ibo iia iib iii iim iin iio im- ima imb imi imm imn imo in- ina inb ini inm inn ino io- ioa iob ioi iom ion ioo m-o maa mab mai mam man mao mba mbb mbi mbm mbo mi- mia mib mii mim min mio mma mmb mmi mmm mmn mmo mna mnb mni mnm mnn mno moa mob moi mom mon moo n-i naa nab nai nam nan nao nba nbb nbi nbm nbn nbo nia nib nii nim nin nio nma nmb nmi nmm nmn nmo nna nnb nni nnm nnn nno no- noa nob noi nom non noo o-i oaa oab oai oam oan oao ob- oba obb obi obm obn obo oia oib oii oim oin oio om- oma omb omi omm omn omo on- ona onb oni onn ono oo- ooa oob ooi oom oon ooo