-ic a-a a-b a-c a-i aaa aab aac aai aam aas ab- aba abb abc abi abm abs ac- aca acb acc aci acm acs ai- aia aib aic aii aim ais ama amb amc ami amm ams as- asa asb asc asi asm ass baa bab bac bai bam bas bba bbb bbc bbi bbm bbs bca bcb bcc bci bcm bcs bi- bia bib bic bii bim bis bma bmb bmc bmi bmm bms bsa bsb bsc bsi bsm bss c-- caa cab cac cai cam cas cba cbb cbc cbi cbm cbs cca ccb ccc cci ccm ccs ci- cia cib cic cii cim cis cma cmb cmc cmi cmm cms csa csb csc csi csm css ia- iaa iab iac iai iam ias iba ibb ibc ibi ibm ibs ica icb icc ici icm ics iia iib iic iii iim iis im- ima imb imc imi imm ims is- isa isb isc isi ism iss maa mab mac mai mam mas mba mbb mbc mbi mbm mbs mc- mca mcb mcc mci mcm mcs mi- mia mib mic mii mim mis mma mmb mmc mmi mmm mms msa msb msc msi msm mss saa sab sac sai sam sas sba sbb sbc sbi sbm sbs sca scb scc sci scm scs sia sib sic sii sim sis sma smb smc smi smm sms ss- ssa ssb ssc ssi ssm sss