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function treeEqual(node1, node2) {
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if (!node1 && !node2) {
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return true;
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}
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if (!node1 || !node2) {
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return false;
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}
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return (
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node1.val == node2.val &&
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treeEqual(node1.left, node2.left) &&
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treeEqual(node1.right, node2.right)
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);
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}
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