úÎ u Þ   The empty bit set. Is the bit set empty? O(setBit on Integer)" Insert an item into the bit set. O(n * setBit on Integer) Make a BitSet from a list of items. O(clearBit on Integer)" Delete an item from the bit set. O(testBit on Integer)) Ask whether the item is in the bit set. O(1)( The number of elements in the bit set. O(1)" Project a bit set to an integer. O(n) Make a bit set of type BitSet a! from an integer. This is unsafe M because it is not checked whether the bits set in the integer correspond to  values of type a9. This is only useful as a more efficient alternative to  fromList.        bitset-1.1 Data.BitSetBitSetemptynullinsertfromListdeletemembersize toIntegralunsafeFromIntegralBS