64 numbers (not necessarily distinct) are placed on the squares of a chessboard such that the sum of the numbers in every 2x2 square is 7.

What is the sum of the four numbers in the corners of the board?

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64 numbers (not necessarily distinct) are placed on the squares of a chessboard such that the sum of the numbers in every 2x2 square is 7.

What is the sum of the four numbers in the corners of the board?

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