1, first of all, the recovery of the position 1, just need to move to the corresponding position of the position 1.

2. Secondly, first move No.2 below the final position, and then move in the direction of the arrow, from the big arrow to the small arrow.

3. Then, the recovery of position 3 is divided into two steps: first, move position 3 below the target position 3, and then move in the direction of the arrow, from the big arrow to the small arrow.

4. Finally, after the recovery of No.3, the second step needs to be carried out, that is, to restore the positions of 1 and 2 and move in the direction of the arrow.