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if (typeof window === 'undefined') {

util = require(__dirname + '/../util.js');

}

function* fib5(n) {

yield 0; // special case

if (n > 0) {

yield 1; // special case

}

let last = 0; // initially set to fib(0)

let next = 1; // initially set to fib(1)

for (let i = 1; i < n; i++) {

let helper = last;

last = next;

next += helper;

yield next; // main generator step

}

}

for (var item of fib5(50)) {

util.out(item);

}