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out vec4 sk_FragColor;
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uniform vec2 ah;
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uniform vec2 bh;
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uniform vec2 af;
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uniform vec2 bf;
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void main() {
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sk_FragColor.x = ah.x * bh.y - ah.y * bh.x;
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sk_FragColor.y = af.x * bf.y - af.y * bf.x;
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}
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