-ic a-a a-b a-c a-i a-t aaa aab aac aai aam aao aar aat ab- aba abb abc abi abm abo abr abt ac- aca acb acc aci acm aco acr act ai- aia aib aic aii aim aio air ait ama amb amc ami amm amo amr amt aoa aob aoc aoi aom aoo aor aot ar- ara arb arc ari arm aro arr art at- ata atb atc ati atm ato atr att baa bab bac bai bam bao bar bat bba bbb bbc bbi bbm bbo bbr bbt bca bcb bcc bci bcm bco bcr bct bi- bia bib bic bii bim bio bir bit bma bmb bmc bmi bmm bmo bmr bmt boa bob boc boi bom boo bor bot bra brb bri brm bro brr brt bta btb btc bti btm bto btr btt c-- caa cab cac cai cam cao car cat cba cbb cbc cbi cbm cbo cbr cbt cca ccb ccc cci ccm cco ccr cct ci- cia cib cic cii cim cio cir cit cma cmb cmc cmi cmm cmo cmr cmt co- coa cob coc coi com coo cor cot cra crb crc cri crm cro crr crt cta ctb ctc cti ctm cto ctr ctt ia- iaa iab iac iai iam iao iar iat iba ibb ibc ibi ibm ibo ibr ibt ica icb icc ici icm ico icr ict iia iib iic iii iim iio iir iit im- ima imb imc imi imm imo imt io- ioa iob ioc ioi iom ioo ior iot ir- ira irb irc iri irm iro irr irt ita itb itc iti itm ito itt m-o m-r maa mab mac mai mam mao mar mat mba mbb mbc mbi mbm mbo mbr mbt mc- mca mcb mcc mci mcm mco mcr mct mi- mia mib mic mii mim mio mir mit mma mmb mmc mmi mmm mmo mmr mmt moa mob moc moi mom moo mor mot mra mrb mrc mri mrm mro mrr mrt mta mtb mtc mti mtm mto mtr mtt o-i oaa oab oac oai oam oao oar oat ob- oba obb obc obi obm obo obr obt oc- oca ocb occ oci ocm oco ocr oct oia oib oic oii oim oio oir oit om- oma omb omc omi omm omo omr omt oo- ooa oob ooc ooi oom ooo oor oot or- ora orb orc ori orm oro orr ort ot- ota otb otc oti otm oto otr ott ra- raa rab rac rai ram rao rar rat rba rbb rbc rbi rbm rbo rbr rbt rca rcb rcc rci rcm rco rcr rct ria rib ric rii rim rio rir rit rma rmb rmc rmi rmm rmo rmr rmt roa rob roc roi rom roo ror rot rra rrb rrc rri rrm rrr rrt rta rtb rtc rti rtm rto rtr rtt taa tab tac tai tam tao tar tat tba tbb tbc tbi tbm tbo tbr tbt tca tcb tcc tci tcm tco tcr tct tia tib tic tii tim tio tir tit tma tmb tmc tmi tmm tmo tmr tmt to- toa tob toc toi tom too tor tot tra trb trc tri trm tro trr trt tta ttb ttc tti ttm tto ttr ttt