# | Line 27 | Line 27 | package java.util; | |
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27 | * Subsets of any {@code NavigableSet} must implement the {@code | |
28 | * NavigableSet} interface. | |
29 | * | |
30 | < | * <p> The return values of navigation methods may be ambiguous in |
30 | > | * <p>The return values of navigation methods may be ambiguous in |
31 | * implementations that permit {@code null} elements. However, even | |
32 | * in this case the result can be disambiguated by checking | |
33 | * {@code contains(null)}. To avoid such issues, implementations of |
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