What does "SD" – print double in trading cards mean?

I collect basketball cards, and I see this legend together with some cards Beckett price guide. What does this "DP – Double Print 'mean exactly? 2 letters different from the same player with the same card?

The dual of this letter were printed. All card games are produced in large sheets which consists of several cards that are cut to size of a single card. In one or more of the leaves of the same card appears twice EA. print double.

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