Suppose we are given an n x n square grid, some of whose squares are colored black and the rest white. Describe and analyze an algorithm to determine whether tokens can be placed on the grid so that • every token is on a white square; • every row of the grid contains exactly one token; and • every column of the grid contains exactly one token. Your input is a two dimensional array IsWhite[][] of booleans, indicating which squares are white. Your output is a single boolean. For example, given the grid below as input, your algorithm should return T.

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