135°180°

270°150°

315°180°

45°0°

30°

315°225°

180°315°

0°

30°

90°

270°

180° 150° 135°

225°

45°

315°

0°

11

1

2

2

4 3

5

5

67

7

7

8

9

1010

11

12 12

13

13

15

1215

79

12

1

1316

5

21

1819

20

14

14

2020

17

16

2

5

5

8

15

1619

1810

14

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