docs: public void updateMass(Instance inst, boolean referenceWindow)
  	{
  		if(referenceWindow)
  			r++;
  		else
  			l++;
  		
  		if(internalNode)
  		{
  			if(inst.value(this.splitAttribute) > this.splitValue)
  				right.updateMass(inst, referenceWindow);
  			else
  				left.updateMass(inst, referenceWindow);
  		}
  	}