-ic a-a a-b a-c a-i aaa aab aac aai aam aao aar ab- aba abb abc abi abm abo abr ac- aca acb acc aci acm aco acr ai- aia aib aic aii aim aio air ama amb amc ami amm amo amr aoa aob aoc aoi aom aoo aor ar- ara arb arc ari arm aro arr baa bab bac bai bam bao bar bba bbb bbc bbi bbm bbo bbr bca bcb bcc bci bcm bco bcr bi- bia bib bic bii bim bio bir bma bmb bmc bmi bmm bmo bmr boa bob boc boi bom boo bor bra brb bri brm bro brr c-- caa cab cac cai cam cao car cba cbb cbc cbi cbm cbo cbr cca ccb ccc cci ccm cco ccr ci- cia cib cic cii cim cio cir cma cmb cmc cmi cmm cmo cmr co- coa cob coc coi com coo cor cra crb crc cri crm cro crr ia- iaa iab iac iai iam iao iar iba ibb ibc ibi ibm ibo ibr ica icb icc ici icm ico icr iia iib iic iii iim iio iir im- ima imb imc imi imm imo io- ioa iob ioc ioi iom ioo ior ir- ira irb irc iri irm iro irr m-o m-r maa mab mac mai mam mao mar mba mbb mbc mbi mbm mbo mbr mc- mca mcb mcc mci mcm mco mcr mi- mia mib mic mii mim mio mir mma mmb mmc mmi mmm mmo mmr moa mob moc moi mom moo mor mra mrb mrc mri mrm mro mrr o-i oaa oab oac oai oam oao oar ob- oba obb obc obi obm obo obr oc- oca ocb occ oci ocm oco ocr oia oib oic oii oim oio oir om- oma omb omc omi omm omo omr oo- ooa oob ooc ooi oom ooo oor or- ora orb orc ori orm oro orr ra- raa rab rac rai ram rao rar rba rbb rbc rbi rbm rbo rbr rca rcb rcc rci rcm rco rcr ria rib ric rii rim rio rir rma rmb rmc rmi rmm rmo rmr roa rob roc roi rom roo ror rra rrb rrc rri rrm rrr