-ic a-a a-b a-c a-i aaa aab aac aai aam aao aas ab- aba abb abc abi abm abo abs ac- aca acb acc aci acm aco acs ai- aia aib aic aii aim aio ais ama amb amc ami amm amo ams aoa aob aoc aoi aom aoo aos as- asa asb asc asi asm aso ass baa bab bac bai bam bao bas bba bbb bbc bbi bbm bbo bbs bca bcb bcc bci bcm bco bcs bi- bia bib bic bii bim bio bis bma bmb bmc bmi bmm bmo bms boa bob boc boi bom boo bos bsa bsb bsc bsi bsm bso bss c-- caa cab cac cai cam cao cas cba cbb cbc cbi cbm cbo cbs cca ccb ccc cci ccm cco ccs ci- cia cib cic cii cim cio cis cma cmb cmc cmi cmm cmo cms co- coa cob coc coi com coo cos csa csb csc csi csm cso css ia- iaa iab iac iai iam iao ias iba ibb ibc ibi ibm ibo ibs ica icb icc ici icm ico ics iia iib iic iii iim iio iis im- ima imb imc imi imm imo ims io- ioa iob ioc ioi iom ioo ios is- isa isb isc isi ism iso iss m-o maa mab mac mai mam mao mas mba mbb mbc mbi mbm mbo mbs mc- mca mcb mcc mci mcm mco mcs mi- mia mib mic mii mim mio mis mma mmb mmc mmi mmm mmo mms moa mob moc moi mom moo mos msa msb msc msi msm mso mss o-i oaa oab oac oai oam oao oas ob- oba obb obc obi obm obo obs oc- oca ocb occ oci ocm oco ocs oia oib oic oii oim oio ois om- oma omb omc omi omm omo oms oo- ooa oob ooc ooi oom ooo oos os- osa osb osc osi osm oso oss saa sab sac sai sam sao sas sba sbb sbc sbi sbm sbo sbs sca scb scc sci scm sco scs sia sib sic sii sim sio sis sma smb smc smi smm smo sms soa sob soc soi som soo sos ss- ssa ssb ssc ssi ssm sso sss