function RandomLetter() {
var base64chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var result = "";
var random = Math.random() * 1073741824;
while (random > 0) {
var char = base64chars.charAt(random % 64);
result += char;
random = Math.floor(random / 64);
}
return result;
};
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