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static IterableIterator shuffledIterator(fL l) { ret new IterableIterator() { int n = l(l); int i = 0; new Map shuffled; public bool hasNext() { ret i < n; } public A next() { int j = random(i, n); A a = get(i), b = get(j); shuffled.put(j, a); shuffled.put(i, b); ret b; } A get(int i) { A a = shuffled.containsKey(i) ? shuffled.get(i) : l.get(i); ++i; ret a; } }; }