a-a a-b aaa aab aad aam aao aas ab- aba abb abd abm abo abs ad- ada adb add adm ado ads ama amb amd amm amo ams aoa aob aod aom aoo aos as- asa asb asd asm aso ass baa bab bad bam bao bas bba bbb bbd bbm bbo bbs bda bdb bdd bdm bdo bds bma bmb bmd bmm bmo bms boa bob bod bom boo bos bsa bsb bsd bsm bso bss daa dab dad dam dao das dba dbb dbd dbm dbo dbs dda ddb ddd ddm ddo dds dma dmb dmd dmm dmo dms doa dob dod dom doo dos dsa dsb dsd dsm dso dss m-o maa mab mad mam mao mas mba mbb mbd mbm mbo mbs mda mdb mdd mdm mdo mds mma mmb mmd mmm mmo mms moa mob mod mom moo mos msa msb msd msm mso mss oaa oab oad oam oao oas ob- oba obb obd obm obo obs oda odb odd odm odo ods om- oma omb omd omm omo oms oo- ooa oob ood oom ooo oos os- osa osb osd osm oso oss saa sab sad sam sao sas sba sbb sbd sbm sbo sbs sda sdb sdd sdm sdo sds sma smb smd smm smo sms soa sob sod som soo sos ss- ssa ssb ssd ssm sso sss