PH: Containing the Letters D-E-F

Thanks to @Lonestarchild for this swap idea.

Send a postcard that contains the letter D (not a picture of a D thing) but a card that actually has a letter D on it (must be on the front of the card). It doesn't have to start with the letter D but the letter D must be in the word. It can be a single word, a quote, a place, whatever.

Then send one with E and one with F.

Send your partner 3 postcards total in an envelope - D-E-F. Postcards should be unwritten and unstamped. They should be store bought only and of good quality. (No handmade/freebie/ad/zazzle).