可达集合R

先行集合Q

交集T = R ∩ Q

S1

1,3,4,8,9,12,13

1

1

S2

2,3,4,5,6,8,9,10,11,12,13

2

2

S3

3,4,8,9,12,13

1,2,3,6,7,8,10

8,3

S4

4,9,12,13

1,2,3,4,6,7,8,10

4

S5

5,9,11,12,13

2,5,11

11,5

S6

3,4,6,8,9,10,12,13

2,6

6

S7

3,4,7,8,9,12,13

7

7

S8

3,4,8,9,12,13

1,2,3,6,7,8,10

8,3

S9

9,12,13

1,2,3,4,5,6,7,8,9,10,11

9

S10

3,4,8,9,10,12,13

2,6,10

10

S11

5,9,11,12,13

2,5,11

11,5

S12

12,13

1,2,3,4,5,6,7,8,9,10,11,12,13

12,13

S13

12,13

1,2,3,4,5,6,7,8,9,10,11,12,13

12,13