code: public static <T> Predicate<Multiset.Entry<T>> occursAtLeast(int n) {
      checkArgument(n >= 0);
      return new OccursAtLeast<>(n);
    }
docs: Guava {@link Predicate} on {@link Multiset.Entry} which passes only if the entry's count
  is greater than or equal to {@code n}, which must be non-negative.