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/usr/lib/nodejs/es5-ext/string/random-uniq.js is in node-es5-ext 0.10.30-1.

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"use strict";

var generated = Object.create(null)

  , random = Math.random;

module.exports = function () {
	var str;
	do {
 str = random().toString(36).slice(2);
} while (generated[str]);
	return str;
};