$$P - 2,\,\,Q - 3,\,\,R - 1$$

$$P - 3,\,\,Q - 1,\,\,R - 2$$

$$P - 1,\,\,Q - 2,\,\,R - 3$$

$$P - 2,\,\,Q - 1,\,\,R - 3$$