Let A be the nearest ANCESTOR of the newly INSERTED NOD which has the balancing factor ±2. Then the rotations can be classified into the following four categories:

Left-Left: The newly inserted node is in the left subtree of the left child of A.
RIGHT-Right: The newly inserted node is in the right subtree of the right child of A.
Left-Right: The newly inserted node is in the right subtree of the left child of A.
Right-Left: The newly inserted node is in the left subtree of the right child of A.

Let A be the nearest ancestor of the newly inserted nod which has the balancing factor ±2. Then the rotations can be classified into the following four categories:

Left-Left: The newly inserted node is in the left subtree of the left child of A.
Right-Right: The newly inserted node is in the right subtree of the right child of A.
Left-Right: The newly inserted node is in the right subtree of the left child of A.
Right-Left: The newly inserted node is in the left subtree of the right child of A.