a-a a-b aaa aab aad aag aao aas ab- aba abb abd abg abo abs ad- ada adb add adg ado ads ag- aga agb agd agg ago ags aoa aob aod aog aoo aos as- asa asb asd asg aso ass baa bab bad bag bao bas bba bbb bbd bbg bbo bbs bda bdb bdd bdg bdo bds bga bgb bgd bgg bgo bgs boa bob bod bog boo bos bsa bsb bsd bsg bso bss daa dab dad dag dao das dba dbb dbd dbg dbo dbs dda ddb ddd ddg ddo dds dga dgd dgg dgs doa dob dod dog doo dos dsa dsb dsd dsg dso dss g-d gaa gab gad gag gao gas gba gbd gbg gbo gbs gda gdb gdd gdo gds gga ggb ggd ggg ggo ggs goa gob god gog goo gos gsa gsb gsd gsg gso gss oaa oab oad oag oao oas ob- oba obb obd obg obo obs oda odb odd odg odo ods oga ogd ogg ogo ogs oo- ooa oob ood oog ooo oos os- osa osb osd osg oso oss saa sab sad sag sao sas sba sbb sbd sbg sbo sbs sda sdb sdd sdg sdo sds sga sgb sgd sgg sgo sgs soa sob sod sog soo sos ss- ssa ssb ssd ssg sso sss