S₁/X₁

0

1

2

3

4

5

6

$f_1^{\ast }$

$X_1^{\ast }$

0

0

0

0

1

3

3

3

0 or 1

2

6

6

3

6

0 or 1

3

9

9

6

1

9

0 or 1

4

9

9

9

4

3

9

0, 1 or 2

5

9

12

12

7

6

3

12

1, or 2

6

9

12

12

10

9

6

1

12

1 or 2