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export default function create(pmath) {
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const add = pmath('add')
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const negate = pmath('negate')
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if (!pmath.subtract) { // avoid double definition at cost of extensibility
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pmath('subtract', [args => args.length === 2,
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(x, y) => add(x, negate(y))])
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}
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return pmath.subtract
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}
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