USING PYTHON: Function takes a nested list as input, and returns True if the nested list contains only integers between 0 and 255, and each row of the matrix has the same length.  Example: >>>image([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) True >>> image([["0x5", "200x2"], ["111x7]]) False

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