In order to not make the game too easy, which letter tile did SCRABBLE inventor Alfred Butts decide to include only four of?

In addition to being a common letter in general, "S" can be used to pluralize countless other words. At the other end of the SCRABBLE alphabet spectrum are the pesky letters "Q" (almost always needs a "U" after) and "J" (which, like "Q," is almost never at the end of a word).

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