The sum of the square of the length of all the chords intercepted by the lines $x + y = n$, $n\epsilon W$ on the circle $x^{2} + y^{2} = 4$ is
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The sum of the square of the length of all the chords intercepted by the lines $x + y = n$, $n\epsilon W$ on the circle $x^{2} + y^{2} = 4$ is