-ic a-a a-b a-c a-i aaa aab aac aai aam aao aar aas ab- aba abb abc abi abm abo abr abs ac- aca acb acc aci acm aco acr acs ai- aia aib aic aii aim aio air ais ama amb amc ami amm amo amr ams aoa aob aoc aoi aom aoo aor aos ar- ara arb arc ari arm aro arr ars as- asa asb asc asi asm aso asr ass baa bab bac bai bam bao bar bas bba bbb bbc bbi bbm bbo bbr bbs bca bcb bcc bci bcm bco bcr bcs bi- bia bib bic bii bim bio bir bis bma bmb bmc bmi bmm bmo bmr bms boa bob boc boi bom boo bor bos bra brb bri brm bro brr brs bsa bsb bsc bsi bsm bso bsr bss c-- caa cab cac cai cam cao car cas cba cbb cbc cbi cbm cbo cbr cbs cca ccb ccc cci ccm cco ccr ccs ci- cia cib cic cii cim cio cir cis cma cmb cmc cmi cmm cmo cmr cms co- coa cob coc coi com coo cor cos cra crb crc cri crm cro crr crs csa csb csc csi csm cso csr css ia- iaa iab iac iai iam iao iar ias iba ibb ibc ibi ibm ibo ibr ibs ica icb icc ici icm ico icr ics iia iib iic iii iim iio iir iis im- ima imb imc imi imm imo ims io- ioa iob ioc ioi iom ioo ior ios ir- ira irb irc iri irm iro irr irs is- isa isb isc isi ism iso isr iss m-o m-r maa mab mac mai mam mao mar mas mba mbb mbc mbi mbm mbo mbr mbs mc- mca mcb mcc mci mcm mco mcr mcs mi- mia mib mic mii mim mio mir mis mma mmb mmc mmi mmm mmo mmr mms moa mob moc moi mom moo mor mos mra mrb mrc mri mrm mro mrr mrs msa msb msc msi msm mso msr mss o-i oaa oab oac oai oam oao oar oas ob- oba obb obc obi obm obo obr obs oc- oca ocb occ oci ocm oco ocr ocs oia oib oic oii oim oio oir ois om- oma omb omc omi omm omo omr oms oo- ooa oob ooc ooi oom ooo oor oos or- ora orb orc ori orm oro orr ors os- osa osb osc osi osm oso osr oss ra- raa rab rac rai ram rao rar ras rba rbb rbc rbi rbm rbo rbr rbs rca rcb rcc rci rcm rco rcr rcs ria rib ric rii rim rio rir ris rma rmb rmc rmi rmm rmo rmr rms roa rob roc roi rom roo ror ros rra rrb rrc rri rrm rrr rrs rsa rsb rsc rsi rsm rso rsr rss saa sab sac sai sam sao sar sas sba sbb sbc sbi sbm sbo sbr sbs sca scb scc sci scm sco scr scs sia sib sic sii sim sio sir sis sma smb smc smi smm smo smr sms soa sob soc soi som soo sor sos sr- sra srb src sri srm sro srr srs ss- ssa ssb ssc ssi ssm sso ssr sss