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Please include a link to Cecil’s column if it’s on the straight dope web site.
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In his column, Cecil Adams says that the fifth card in Wild Bill Hickok’s original «dead man’s hand» is the two of spades. The link kindly provided by sbh says the following:
The author of the page had suggested the two of spades, but says «my initial claim of the deuce of spades is the most laughable, embarrassing suggestion to date. I’m not even sure what I was thinking. All indications seem to point to the fact that the fifth card in a Dead Man’s Hand is a diamond, but everybody can’t agree on which one it was.» The author mentions that «I can’t remember where I read it (that the fifth card was the deuce of spades).» Maybe he read it in the Straight Dope column? I will e-mail him.