3 module.exports = function paethPredictor(left, above, upLeft) {
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5 var paeth = left + above - upLeft;
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6 var pLeft = Math.abs(paeth - left);
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7 var pAbove = Math.abs(paeth - above);
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8 var pUpLeft = Math.abs(paeth - upLeft);
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10 if (pLeft <= pAbove && pLeft <= pUpLeft) {
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13 if (pAbove <= pUpLeft) {
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