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Return the index of the first four in an array. Return -1 if there are none.
X369: Find Four
Return the index of the first four in an array. Return -1 if there are none.
Examples:
findFour({4,1,4,0,0,0,2,4,4,1,4}) -> 0
findFour({0,1,4,0,0,0,2,4,4,1,4}) -> 2
findFour({}) -> -1
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