-ic a-a a-b a-c a-i aaa aab aac aai aak aam aao aar ab- aba abb abc abi abk abm abo abr ac- aca acb acc aci ack acm aco acr ai- aia aib aic aii aik aim aio air aka akb akc aki akk akm ako akr ama amb amc ami amk amm amo amr aoa aob aoc aoi aok aom aoo aor ar- ara arb arc ari ark arm aro arr baa bab bac bai bak bam bao bar bba bbb bbc bbi bbk bbm bbo bbr bca bcb bcc bci bck bcm bco bcr bi- bia bib bic bii bik bim bio bir bka bkb bkc bkk bkm bko bkr bma bmb bmc bmi bmk bmm bmo bmr boa bob boc boi bok bom boo bor bra brb bri brk brm bro brr c-- caa cab cac cai cak cam cao car cba cbb cbc cbi cbk cbm cbo cbr cca ccb ccc cci cck ccm cco ccr ci- cia cib cic cii cik cim cio cir cka ckb ckc cki ckm cko cma cmb cmc cmi cmk cmm cmo cmr co- coa cob coc coi cok com coo cor cra crb crc cri crk crm cro crr ia- iaa iab iac iai iam iao iar iba ibb ibc ibi ibk ibm ibo ibr ica icb icc ici ick icm ico icr iia iib iic iii iim iio iir ika ikb ikc iki ikk iko ikr im- ima imb imc imi imm imo io- ioa iob ioc ioi iom ioo ior ir- ira irb irc iri irk irm iro irr ka- kaa kab kac kai kak kam kao kar kba kbb kbc kbi kbk kbm kbo kbr kca kcb kcc kci kck kcm kcr kia kib kic kii kik kim kio kir kkb kkc kki kkk kkm kkr kma kmb kmc kmi kmk kmm kmo koa kob koc koi kok kom koo kor kra krc kri krk kro krr m-o m-r maa mab mac mai mak mam mao mar mba mbb mbc mbi mbk mbm mbo mbr mc- mca mcb mcc mci mck mcm mco mcr mi- mia mib mic mii mik mim mio mir mka mkb mkc mkk mkm mko mkr mma mmb mmc mmi mmk mmm mmo mmr moa mob moc moi mok mom moo mor mra mrb mrc mri mrk mrm mro mrr o-i oaa oab oac oai oak oam oao oar ob- oba obb obc obi obk obm obo obr oc- oca ocb occ oci ock ocm oco ocr oia oib oic oii oik oim oio oir oka okb okc oki okk oko okr om- oma omb omc omi omm omo omr oo- ooa oob ooc ooi ook oom ooo oor or- ora orb orc ori ork orm oro orr ra- raa rab rac rai rak ram rao rar rba rbb rbc rbi rbk rbm rbo rbr rca rcb rcc rci rcm rco rcr ria rib ric rii rik rim rio rir rkb rkc rkk rkm rko rma rmb rmc rmi rmm rmo rmr roa rob roc roi rok rom roo ror rra rrb rrc rri rrk rrm rrr