3

(a)  

4

(a)  

5

(a)  

6

(a)  

7

(a)  

1

(a)  

2

(a)  

3

(a)  

4

(a)  

1

(a)  

(a)  

2

(a)  

3

(a)  

4

(a)  

5

(a)  

2

(a)