-ic a-a a-b a-c a-i aaa aab aac aae aai aam aao aas ab- aba abb abc abe abi abm abo abs ac- aca acb acc ace aci acm aco acs aea aeb aec aee aei aem aeo aes ai- aia aib aic aie aii aim aio ais ama amb amc ame ami amm amo ams aoa aob aoc aoe aoi aom aoo aos as- asa asb asc ase asi asm aso ass baa bab bac bae bai bam bao bas bba bbb bbc bbe bbi bbm bbo bbs bca bcb bcc bce bci bcm bco bcs be- bea beb bec bee bei bem beo bes bi- bia bib bic bie bii bim bio bis bma bmb bmc bme bmi bmm bmo bms boa bob boc boe boi bom boo bos bsa bsb bsc bse bsi bsm bso bss c-- caa cab cac cae cai cam cao cas cba cbb cbc cbe cbi cbm cbo cbs cca ccb ccc cce cci ccm cco ccs ce- cea ceb cec cee cei cem ceo ces ci- cia cib cic cie cii cim cio cis cma cmb cmc cme cmi cmm cmo cms co- coa cob coc coe coi com coo cos csa csb csc cse csi csm cso css eaa eab eac eae eai eam eao eas eba ebb ebc ebe ebi ebm ebo ebs ec- eca ecb ecc ece eci ecm eco ecs eea eeb eec eee eem eeo ees eia eib eic eie eii eim eio eis em- ema emb emc eme emi emm emo ems eo- eoa eob eoc eoe eoi eom eoo eos es- esa esb esc ese esi esm eso ess ia- iaa iab iac iae iai iam iao ias iba ibb ibc ibe ibi ibm ibo ibs ica icb icc ice ici icm ico ics ie- iea iec iee iei iem ies iia iib iic iie iii iim iio iis im- ima imb imc ime imi imm imo ims io- ioa iob ioc ioe ioi iom ioo ios is- isa isb isc ise isi ism iso iss m-o maa mab mac mae mai mam mao mas mba mbb mbc mbe mbi mbm mbo mbs mc- mca mcb mcc mce mci mcm mco mcs mea meb mec mee mei mem meo mes mi- mia mib mic mie mii mim mio mis mma mmb mmc mme mmi mmm mmo mms moa mob moc moe moi mom moo mos msa msb msc mse msi msm mso mss o-i oaa oab oac oae oai oam oao oas ob- oba obb obc obe obi obm obo obs oc- oca ocb occ oci ocm oco ocs oea oeb oec oee oei oem oeo oes oia oib oic oie oii oim oio ois om- oma omb omc ome omi omm omo oms oo- ooa oob ooc ooi oom ooo oos os- osa osb osc ose osi osm oso oss saa sab sac sae sai sam sao sas sba sbb sbc sbe sbi sbm sbo sbs sca scb scc sce sci scm sco scs se- sea seb sec see sei sem seo ses sia sib sic sie sii sim sio sis sma smb smc sme smi smm smo sms soa sob soc soe soi som soo sos ss- ssa ssb ssc sse ssi ssm sso sss