a-a a-c aaa aac aad aaf aam aao ac- aca acc acd acf acm aco ad- ada adc add adf adm ado af- afa afc afd aff afm afo ama amc amd amf amm amo aoa aoc aod aof aom aoo c-- caa cac cad caf cam cao cca ccc ccd ccf ccm cco cda cdc cdd cdf cdm cdo cfa cfc cfd cff cfm cfo cma cmc cmd cmf cmm cmo co- coa coc cod cof com coo daa dac dad daf dam dao dca dcc dcd dcf dcm dco dda ddc ddd ddf ddm ddo dfa dfc dfd dff dfm dfo dma dmc dmd dmf dmm dmo doa doc dod dof dom doo faa fac fad faf fam fao fca fcc fcd fcf fcm fco fda fdc fdd fdf fdm fdo ffa ffc ffd fff ffm ffo fma fmc fmd fmf fmm fmo foa foc fof fom foo m-f m-o maa mac mad maf mam mao mc- mca mcc mcd mcf mcm mco mda mdc mdd mdf mdm mdo mfa mfc mfd mff mfm mfo mma mmc mmd mmf mmm mmo moa moc mod mof mom moo oaa oac oad oaf oam oao oc- oca occ ocd ocf ocm oco oda odc odd odf odm odo of- ofa ofc ofd off ofm ofo om- oma omc omd omf omm omo oo- ooa ooc ood oof oom ooo