@Override
public Object removing(int index, Paired<BlockParser, Block> paired) {
Block block = paired.getSecond();
if (block != null) nodeClassifier.remove(block);
return paired;
}
@Override
public void adding(int index, Paired<BlockParser, Block> paired, Object v) {
Block block = paired.getSecond();
if (block != null) nodeClassifier.add(block);
}