Just a quick demo for your viewing pleasure.

A computer screen displays a graphing calculator interface with a diamond-patterned grid plot. The plot shows alternating shaded and unshaded diamonds. Below the graph, three input fields are visible: the first contains the mathematical function f(x,y) = y - x + kx + k sin((2 - π)/2 x - y), the second contains f(sin x, sin y)f(-sin y, sin x) ≤ 0, and the third shows k = 0.165 with a slider set to that value. The interface includes standard toolbar icons and a menu button in the top left corner.

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