The "10" means any 10 value cards i.e. 10, Jack, Queen or King. In the game of Blackjack all tens and face cards have a value of "10".
I am assuming that the reader is at least somewhat familiar with the game of Blackjack or "21" as it is played in casinos and homes around the world.
If not then I recommend that the reader familiarize himself with the game before performing this particular effect.
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