a-a a-b a-i a-t aaa aab aai aam aao aar aat ab- aba abb abi abm abo abr abt ai- aia aib aii aim aio air ait ama amb ami amm amo amr amt aoa aob aoi aom aoo aor aot ar- ara arb ari arm aro arr art at- ata atb ati atm ato atr att baa bab bai bam bao bar bat bba bbb bbi bbm bbo bbr bbt bi- bia bib bii bim bio bir bit bma bmb bmi bmm bmo bmr bmt boa bob boi bom boo bor bot bra brb bri brm bro brr brt bta btb bti btm bto btr btt ia- iaa iab iai iam iao iar iat iba ibb ibi ibm ibo ibr ibt iia iib iii iim iio iir iit im- ima imb imi imm imo imt io- ioa iob ioi iom ioo ior iot ir- ira irb iri irm iro irr irt ita itb iti itm ito itt m-o m-r maa mab mai mam mao mar mat mba mbb mbi mbm mbo mbr mbt mi- mia mib mii mim mio mir mit mma mmb mmi mmm mmo mmr mmt moa mob moi mom moo mor mot mra mrb mri mrm mro mrr mrt mta mtb mti mtm mto mtr mtt o-i oaa oab oai oam oao oar oat ob- oba obb obi obm obo obr obt oia oib oii oim oio oir oit om- oma omb omi omm omo omr omt oo- ooa oob ooi oom ooo oor oot or- ora orb ori orm oro orr ort ot- ota otb oti otm oto otr ott ra- raa rab rai ram rao rar rat rba rbb rbi rbm rbo rbr rbt ria rib rii rim rio rir rit rma rmb rmi rmm rmo rmr rmt roa rob roi rom roo ror rot rra rrb rri rrm rrr rrt rta rtb rti rtm rto rtr rtt taa tab tai tam tao tar tat tba tbb tbi tbm tbo tbr tbt tia tib tii tim tio tir tit tma tmb tmi tmm tmo tmr tmt to- toa tob toi tom too tor tot tra trb tri trm tro trr trt tta ttb tti ttm tto ttr ttt