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29 | * @key randomness | |
30 | */ | |
31 | ||
32 | < | import java.util.*; |
32 | > | import java.util.ArrayList; |
33 | > | import java.util.Collections; |
34 | > | import java.util.HashSet; |
35 | > | import java.util.List; |
36 | > | import java.util.Random; |
37 | ||
38 | public class Disjoint { | |
39 | static final int N = 20; |
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