source);
    }
  }

  /** Construct a new {@link java.util.Set} that is the intersection of the given sets. */
  public static <T> Set<T> intersection(Set<? extends T> set1, Set<? extends T> set2) {
    Set<T> result = Helpers.<T>copyToSet(set1);
    result.retainAll(set2);
    return result;
  }

          source);
    }
  }

  /** Construct a new {@link java.util.Set} that is the intersection of the given sets. */
  public static <T> Set<T> intersection(Set<? extends T> set1, Set<? extends T> set2) {
    Set<T> result = Helpers.<T>copyToSet(set1);
    result.retainAll(set2);
    return result;
  }