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function fibGenerator() {
	prev1 = 0
	prev2 = 1
	function next() {
		result = prev1 + prev2
		prev1 = prev2
		prev2 = result
		return prev2
    }
	return next;
}

var fib = fibGenerator();

fib(); // 1
fib(); // 1
fib(); // 2
fib(); // 3
fib(); // 5
fib(); // 8