func ContainsTree2(t1, t2 *tree.Tree) bool {
	if t2 == nil {
		return true
	}
	return subTree(t1, t2)
}
// ContainsTree2 solves ch04-p10

ContainsTree2 solves ch04-p10
// ContainsTree2 solves ch04 - p10
func ContainsTree2(t1, t2 *tree.Tree) bool {
	if t2 == nil {
		return true
	}
	return subTree(t1, t2)
}
func ContainsTree2 ( t1 , t2 * tree . Tree ) bool { if t2 == nil { return true } return subTree ( t1 , t2 ) }
ContainsTree2 solves ch04-p10
ContainsTree2 solves ch04 - p10