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'use strict';
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var isArray = Array.isArray, forEach = Array.prototype.forEach
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, push = Array.prototype.push;
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module.exports = function flatten() {
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var r = [];
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forEach.call(this, function (x) {
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push.apply(r, isArray(x) ? flatten.call(x) : [x]);
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});
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return r;
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};
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