4-1

x1

1/1

4-2

x1

1/1

4-3

x1

1/1

4-4

x1

1/1

4-5

x1

1/1

4-6

x1

1/1

4-7

x1

1/1

4-8

x1

1/1

4-9

x1

1/1

4-10

x1

1/1