16 



1991 



D 

 D 



CI 



D 

 D 



R7-I1-P1-A17 

 Rl 



Rl 

 D 



Rl 



CI 



R4 



R2 



Rl 



S 



CI 



Rl 



D 



D 



R5 



R2 



D 



no plants 



RIO 

 D 



29 a 



R2 



R2-I1-F14-A20 



R2 



30 a R4-I1-F3-A23 

 b R2 



R4 

 R2 



R2 



R4 



