public AproxBucket deleteBucket(){
		if(up!=null){
			up.down = down;
			if(down != null){
				down.up = up;
			}else{
				return null;
			}
		}
		else{
			if(down != null){
				down.up = null;
				return down;
			}else{
				return null;
			}
		}
		return null;
	}