a-a aaa aad aaf aam aao ad- ada add adf adm ado af- afa afd aff afm afo ama amd amf amm amo aoa aod aof aom aoo daa dad daf dam dao dda ddd ddf ddm ddo dfa dfd dff dfm dfo dma dmd dmf dmm dmo doa dod dof dom doo faa fad faf fam fao fda fdd fdf fdm fdo ffa ffd fff ffm ffo fma fmd fmf fmm fmo foa fof fom foo m-f m-o maa mad maf mam mao mda mdd mdf mdm mdo mfa mfd mff mfm mfo mma mmd mmf mmm mmo moa mod mof mom moo oaa oad oaf oam oao oda odd odf odm odo of- ofa ofd off ofm ofo om- oma omd omf omm omo oo- ooa ood oof oom ooo