a-a a-b a-i aaa aab aae aai aam aao aas ab- aba abb abe abi abm abo abs aea aeb aee aei aem aeo aes ai- aia aib aie aii aim aio ais ama amb ame ami amm amo ams aoa aob aoe aoi aom aoo aos as- asa asb ase asi asm aso ass baa bab bae bai bam bao bas bba bbb bbe bbi bbm bbo bbs be- bea beb bee bei bem beo bes bi- bia bib bie bii bim bio bis bma bmb bme bmi bmm bmo bms boa bob boe boi bom boo bos bsa bsb bse bsi bsm bso bss eaa eab eae eai eam eao eas eba ebb ebe ebi ebm ebo ebs eea eeb eee eem eeo ees eia eib eie eii eim eio eis em- ema emb eme emi emm emo ems eo- eoa eob eoe eoi eom eoo eos es- esa esb ese esi esm eso ess ia- iaa iab iae iai iam iao ias iba ibb ibe ibi ibm ibo ibs ie- iea iee iei iem ies iia iib iie iii iim iio iis im- ima imb ime imi imm imo ims io- ioa iob ioe ioi iom ioo ios is- isa isb ise isi ism iso iss m-o maa mab mae mai mam mao mas mba mbb mbe mbi mbm mbo mbs mea meb mee mei mem meo mes mi- mia mib mie mii mim mio mis mma mmb mme mmi mmm mmo mms moa mob moe moi mom moo mos msa msb mse msi msm mso mss o-i oaa oab oae oai oam oao oas ob- oba obb obe obi obm obo obs oea oeb oee oei oem oeo oes oia oib oie oii oim oio ois om- oma omb ome omi omm omo oms oo- ooa oob ooi oom ooo oos os- osa osb ose osi osm oso oss saa sab sae sai sam sao sas sba sbb sbe sbi sbm sbo sbs se- sea seb see sei sem seo ses sia sib sie sii sim sio sis sma smb sme smi smm smo sms soa sob soe soi som soo sos ss- ssa ssb sse ssi ssm sso sss