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    C
    public class Solution {
        public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
            if (t1 == null) {
                return t2;
            }
            if (t2 == null) {
                return t1;
            }
            TreeNode root = new TreeNode(t1.val + t2.val);
            root.left = mergeTrees(t1.left, t2.left);
            root.right = mergeTrees(t1.right, t2.right);
            return root;
        }
    }
    

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