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✨ all elements in two binary search trees

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	`1`	`+/**`
	`2`	`+ * Definition for a binary tree node.`
	`3`	`+ * function TreeNode(val) {`
	`4`	`+ * this.val = val;`
	`5`	`+ * this.left = this.right = null;`
	`6`	`+ * }`
	`7`	`+ */`
	`8`	`+/**`
	`9`	`+ * @param {TreeNode} root1`
	`10`	`+ * @param {TreeNode} root2`
	`11`	`+ * @return {number[]}`
	`12`	`+ */`
	`13`	`+var getAllElements = function (root1, root2) {`
	`14`	`+ const res = [];`
	`15`	`+ dfs(root1);`
	`16`	`+ dfs(root2);`
	`17`	`+ res.sort((x, y) => x - y);`
	`18`	`+ return res;`
	`19`	`+`
	`20`	`+ function dfs(node) {`
	`21`	`+ if (!node) return;`
	`22`	`+ res.push(node.val);`
	`23`	`+ dfs(node.left);`
	`24`	`+ dfs(node.right);`
	`25`	`+ }`
	`26`	`+};`

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