2n -+- 1 • 



2n -f- i ^2 



2n + 2*2 



Af 







*? 





L 



A/ 





I 2 



<i 



2 2 2 





7 7 7' 7 



/ / / / 



/ / / / 



/ / / / 



iL 



2 2 



i 



2 I 





Figure 105. See opposite page for legend. 



2m 



