cos(x, y) = 0, corr(x, y)=0, Euclidean(x, y) = 2
cos(x, y) = 1, corr(x, y)=0, Euclidean(x, y) = 2
cos(x, y) = 1, corr(x, y)=0, Euclidean(x, y) = 1
cos(x, y) = 0, corr(x, y)=1, Euclidean(x, y) = 2
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