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# Definition for a binary tree node.

class TreeNode:

def __init__(self, val=0, left=None, right=None):

self.val = val

self.left = left

self.right = right

class Solution:

def isSameTree(self, p: TreeNode, q: TreeNode) -> bool:

if p is None or q is None:

return p == q

return p.val == q.val and self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right)