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class Solution:
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    def projectionArea(self, grid: List[List[int]]) -> int:
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        total = 0
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        # top
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        total += sum([1 for i in grid for j in i if j > 0])
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        # front
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        total += sum([max(col) for col in zip(*grid)])
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        # side
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        total += sum([max(row) for row in grid])
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        return total