(1) The word "postcard" contains the word "card".
(2) An image of a baseball player can be printed on the front of a postcard.
(3) If an image of a baseball player is printed on the front of a postcard, it is now a baseball player postcard.
(4) The phrase "baseball player postcard" can be reduced to "baseball card".
(5) Therefore, a baseball player postcard is a baseball card.
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