20-1

x1

1/1

20-2

x1

1/1

20-3

x1

1/1

20-4

x1

1/1

20-5

x1

1/1

20-6

x1

1/1

20-7

x1

1/1

20-8

x1

1/1

20-9

x1

1/1

20-10

x1

1/1