a-a a-b a-i aaa aab aai aam aao aar aax ab- aba abb abi abm abo abr abx ai- aia aib aii aim aio air aix ama amb ami amm amo amr amx aoa aob aoi aom aoo aor aox ar- ara arb ari arm aro arr arx ax- axa axi axm axo axr axx baa bab bai bam bao bar bax bba bbb bbi bbm bbo bbr bbx bi- bia bib bii bim bio bir bix bma bmb bmi bmm bmo bmr bmx boa bob boi bom boo bor box bra brb bri brm bro brr brx bxb bxi bxm bxo bxx ia- iaa iab iai iam iao iar iba ibb ibi ibm ibo ibr ibx iia iib iii iim iio iir iix im- ima imb imi imm imo imx io- ioa iob ioi iom ioo ior ir- ira irb iri irm iro irr irx ixi m-o m-r maa mab mai mam mao mar max mba mbb mbi mbm mbo mbr mbx mi- mia mib mii mim mio mir mix mma mmb mmi mmm mmo mmr mmx moa mob moi mom moo mor mox mra mrb mri mrm mro mrr mrx mxa mxi mxr o-i oaa oab oai oam oao oar oax ob- oba obb obi obm obo obr obx oia oib oii oim oio oir om- oma omb omi omm omo omr omx oo- ooa oob ooi oom ooo oor oox or- ora orb ori orm oro orr orx ox- oxa oxb oxi oxo oxx ra- raa rab rai ram rao rar rax rba rbb rbi rbm rbo rbr rbx ria rib rii rim rio rir rix rma rmb rmi rmm rmo rmr rmx roa rob roi rom roo ror rox rra rrb rri rrm rrr rxr xaa xam xar xbr xbx xia xii xio xix xma xmi xmm xmo xmr xmx xoa xoi xom xoo xor xox xrx xxi xxo xxx