background image

a

f

g1 

g2 

g4

b

g

a2

a1

a3

d

e

b2

b3

b1

1.1

b,d,e,

f,g

1.2

2.1

2.2

2.3

1

3

2

3

2

stop

3.1

3.2

4.1

4.2

4.3

1

4

3.3

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