import java.util.*;
class Ideone {
public static void main
(String[] args
) { for (int i : range(10, 20, 3))
for (int i : range(30, 20, 3))
}
private static List<Integer> range(int start, int stop, int step) {
for (int i = start; i < stop; i += step)
result.add(i);
return result;
}
}
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