@Override
	public Sentence_tree copy(){
		Node the_node = new Node(this.root.name, this.root.POS, this.root.function);
		Sentence_tree the_copy = new Sentence_tree(the_node);
		
		for(int index = 0; index < this.children.length; index++){
			the_copy.add_child(this.children[index].copy());
		}
		
		return the_copy;
	}