ddd dde ddf ddm ddo de- ded dee def dem deo dfd dfe dff dfm dfo dmd dme dmf dmm dmo dod doe dof dom doo ed- edd ede edf edm edo eed eee eef eem eeo ef- efd efe eff efm efo em- emd eme emf emm emo eo- eod eoe eof eom eoo fdd fde fdf fdm fdo fed fee fef fem feo ffd ffe fff ffm ffo fmd fme fmf fmm fmo foe fof fom foo m-f m-o mdd mde mdf mdm mdo med mee mef mem meo mfd mfe mff mfm mfo mmd mme mmf mmm mmo mod moe mof mom moo odd ode odf odm odo oed oee oef oem oeo of- ofd ofe off ofm ofo om- omd ome omf omm omo oo- ood oof oom ooo