| 12345678910111213141516171819 | var choice = require('./choice');    var _chars = '0123456789abcdef'.split('');    /**     * Returns a random hexadecimal string     */    function randHex(size){        size = size && size > 0? size : 6;        var str = '';        while (size--) {            str += choice(_chars);        }        return str;    }    module.exports = randHex;
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