a-a a-b a-c aaa aab aac aad aae aam aao aas ab- aba abb abc abd abe abm abo abs ac- aca acb acc acd ace acm aco acs ad- ada adb adc add ade adm ado ads aea aeb aec aed aee aem aeo aes ama amb amc amd ame amm amo ams aoa aob aoc aod aoe aom aoo aos as- asa asb asc asd ase asm aso ass baa bab bac bad bae bam bao bas bba bbb bbc bbd bbe bbm bbo bbs bca bcb bcc bcd bce bcm bco bcs bda bdb bdc bdd bde bdm bdo bds be- bea beb bec bed bee bem beo bes bma bmb bmc bmd bme bmm bmo bms boa bob boc bod boe bom boo bos bsa bsb bsc bsd bse bsm bso bss c-- caa cab cac cad cae cam cao cas cba cbb cbc cbd cbe cbm cbo cbs cca ccb ccc ccd cce ccm cco ccs cda cdb cdc cdd cde cdm cdo cds ce- cea ceb cec ced cee cem ceo ces cma cmb cmc cmd cme cmm cmo cms co- coa cob coc cod coe com coo cos csa csb csc csd cse csm cso css daa dab dac dad dae dam dao das dba dbb dbc dbd dbe dbm dbo dbs dca dcb dcc dcd dce dcm dco dcs dda ddb ddc ddd dde ddm ddo dds de- dea deb dec ded dee dem deo des dma dmb dmc dmd dme dmm dmo dms doa dob doc dod doe dom doo dos dsa dsb dsc dsd dse dsm dso dss eaa eab eac ead eae eam eao eas eba ebb ebc ebd ebe ebm ebo ebs ec- eca ecb ecc ecd ece ecm eco ecs ed- eda edb edc edd ede edm edo eds eea eeb eec eed eee eem eeo ees em- ema emb emc emd eme emm emo ems eo- eoa eob eoc eod eoe eom eoo eos es- esa esb esc esd ese esm eso ess m-o maa mab mac mad mae mam mao mas mba mbb mbc mbd mbe mbm mbo mbs mc- mca mcb mcc mcd mce mcm mco mcs mda mdb mdc mdd mde mdm mdo mds mea meb mec med mee mem meo mes mma mmb mmc mmd mme mmm mmo mms moa mob moc mod moe mom moo mos msa msb msc msd mse msm mso mss oaa oab oac oad oae oam oao oas ob- oba obb obc obd obe obm obo obs oc- oca ocb occ ocd ocm oco ocs oda odb odc odd ode odm odo ods oea oeb oec oed oee oem oeo oes om- oma omb omc omd ome omm omo oms oo- ooa oob ooc ood oom ooo oos os- osa osb osc osd ose osm oso oss saa sab sac sad sae sam sao sas sba sbb sbc sbd sbe sbm sbo sbs sca scb scc scd sce scm sco scs sda sdb sdc sdd sde sdm sdo sds se- sea seb sec sed see sem seo ses sma smb smc smd sme smm smo sms soa sob soc sod soe som soo sos ss- ssa ssb ssc ssd sse ssm sso sss