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var ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
random_base64 = function random_base64(length) {
var str = "";
for (var i=0; i < length; ++i) {
var rand = Math.floor(Math.random() * ALPHABET.length);
str += ALPHABET.substring(rand, rand+1);
}
return str;
}