degree = 2; xs = [1, √2/2, 0, -√2/2, -1, -√2/2, 0, √2/2, 1] ys = [0, √2/2, 1, √2/2, 0, -√2/2, -1, -√2/2, 0] ws = [1, √2/2, 1, √2/2, 1, √2/2, 1, √2/2, 1] knots = [0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 4]
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