@Override
 public ArrayContainer and(final ArrayContainer value2) {
   final ArrayContainer answer = new ArrayContainer(value2.content.length);
   for (int k = 0; k < value2.getCardinality(); ++k)
     if (this.contains(value2.content[k]))
       answer.content[answer.cardinality++] = value2.content[k];
   return answer;
 }
 @Override
 public Container xor(final ArrayContainer value2) {
   final BitmapContainer answer = clone();
   for (int k = 0; k < value2.getCardinality(); ++k) {
     final int index = Util.toIntUnsigned(value2.content[k]) >>> 6;
     answer.cardinality +=
         1 - 2 * ((answer.bitmap[index] & (1l << value2.content[k])) >>> value2.content[k]);
     answer.bitmap[index] = answer.bitmap[index] ^ (1l << value2.content[k]);
   }
   if (answer.cardinality <= ArrayContainer.DEFAULT_MAX_SIZE) return answer.toArrayContainer();
   return answer;
 }
 @Override
 public Container ixor(final ArrayContainer value2) {
   for (int k = 0; k < value2.getCardinality(); ++k) {
     final int index = Util.toIntUnsigned(value2.content[k]) >>> 6;
     this.cardinality +=
         1 - 2 * ((this.bitmap[index] & (1l << value2.content[k])) >>> value2.content[k]);
     this.bitmap[index] ^= (1l << value2.content[k]);
   }
   if (this.cardinality <= ArrayContainer.DEFAULT_MAX_SIZE) {
     return this.toArrayContainer();
   }
   return this;
 }
 @Override
 public boolean intersects(ArrayContainer value2) {
   for (int k = 0; k < value2.getCardinality(); ++k)
     if (this.contains(value2.content[k])) return true;
   return false;
 }