-ic a-a a-b a-c a-i aaa aab aac aae aai aam aas ab- aba abb abc abe abi abm abs ac- aca acb acc ace aci acm acs aea aeb aec aee aei aem aes ai- aia aib aic aie aii aim ais ama amb amc ame ami amm ams as- asa asb asc ase asi asm ass baa bab bac bae bai bam bas bba bbb bbc bbe bbi bbm bbs bca bcb bcc bce bci bcm bcs be- bea beb bec bee bei bem bes bi- bia bib bic bie bii bim bis bma bmb bmc bme bmi bmm bms bsa bsb bsc bse bsi bsm bss c-- caa cab cac cae cai cam cas cba cbb cbc cbe cbi cbm cbs cca ccb ccc cce cci ccm ccs ce- cea ceb cec cee cei cem ces ci- cia cib cic cie cii cim cis cma cmb cmc cme cmi cmm cms csa csb csc cse csi csm css eaa eab eac eae eai eam eas eba ebb ebc ebe ebi ebm ebs ec- eca ecb ecc ece eci ecm ecs eea eeb eec eee eem ees eia eib eic eie eii eim eis em- ema emb emc eme emi emm ems es- esa esb esc ese esi esm ess ia- iaa iab iac iae iai iam ias iba ibb ibc ibe ibi ibm ibs ica icb icc ice ici icm ics ie- iea iec iee iei iem ies iia iib iic iie iii iim iis im- ima imb imc ime imi imm ims is- isa isb isc ise isi ism iss maa mab mac mae mai mam mas mba mbb mbc mbe mbi mbm mbs mc- mca mcb mcc mce mci mcm mcs mea meb mec mee mei mem mes mi- mia mib mic mie mii mim mis mma mmb mmc mme mmi mmm mms msa msb msc mse msi msm mss saa sab sac sae sai sam sas sba sbb sbc sbe sbi sbm sbs sca scb scc sce sci scm scs se- sea seb sec see sei sem ses sia sib sic sie sii sim sis sma smb smc sme smi smm sms ss- ssa ssb ssc sse ssi ssm sss