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static L> splitIterator(final int n, final Iterator it) {
class SplitIterator {
final int[] positions = repIntAsArray(n, -1);
CircularArrayList buffer;
int first;
L> iterators() {
new L> l;
for _i to n: {
final int i = _i;
l.add((IterableIterator) iteratorFF(func {
positions[i]++;
updateBuffer();
ret buffer.get(positions[i]-first);
}));
}
ret l;
}
int last() { ret first+l(buffer); }
void updateBuffer {
int min = min(positions), max = max(positions);
while (min > first) { buffer.remove(0); ++first; }
while (max > last()) buffer.add(it.next());
}
}
ret new SplitIterator().iterators();
}