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/// RECURSIVE

var fib = function (n) {
    return n < 2 ? n : fib(n-1) + fib(n-2);
}

/// MEMOIZED

var memo = [0,1];
var fib = function(n) {

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var shuffle = function(v){
    for(var j, x, i = v.length; i; j = parseInt(Math.random() * i), x = v[--i], v[i] = v[j], v[j] = x);
    return v;
};