a-a a-b a-c aaa aab aac aad aam aao aas ab- aba abb abc abd abm abo abs ac- aca acb acc acd acm aco acs ad- ada adb adc add adm ado ads ama amb amc amd amm amo ams aoa aob aoc aod aom aoo aos as- asa asb asc asd asm aso ass baa bab bac bad bam bao bas bba bbb bbc bbd bbm bbo bbs bca bcb bcc bcd bcm bco bcs bda bdb bdc bdd bdm bdo bds bma bmb bmc bmd bmm bmo bms boa bob boc bod bom boo bos bsa bsb bsc bsd bsm bso bss c-- caa cab cac cad cam cao cas cba cbb cbc cbd cbm cbo cbs cca ccb ccc ccd ccm cco ccs cda cdb cdc cdd cdm cdo cds cma cmb cmc cmd cmm cmo cms co- coa cob coc cod com coo cos csa csb csc csd csm cso css daa dab dac dad dam dao das dba dbb dbc dbd dbm dbo dbs dca dcb dcc dcd dcm dco dcs dda ddb ddc ddd ddm ddo dds dma dmb dmc dmd dmm dmo dms doa dob doc dod dom doo dos dsa dsb dsc dsd dsm dso dss m-o maa mab mac mad mam mao mas mba mbb mbc mbd mbm mbo mbs mc- mca mcb mcc mcd mcm mco mcs mda mdb mdc mdd mdm mdo mds mma mmb mmc mmd mmm mmo mms moa mob moc mod mom moo mos msa msb msc msd msm mso mss oaa oab oac oad oam oao oas ob- oba obb obc obd obm obo obs oc- oca ocb occ ocd ocm oco ocs oda odb odc odd odm odo ods om- oma omb omc omd omm omo oms oo- ooa oob ooc ood oom ooo oos os- osa osb osc osd osm oso oss saa sab sac sad sam sao sas sba sbb sbc sbd sbm sbo sbs sca scb scc scd scm sco scs sda sdb sdc sdd sdm sdo sds sma smb smc smd smm smo sms soa sob soc sod som soo sos ss- ssa ssb ssc ssd ssm sso sss