e)


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FIGURE 2-4 (cont.)


o 0 --- cJ 0 C C C N NN NN N tO"M tont
- c 3 N M o CJ o to o- C< c tor
X X >c >4,X > x >% x >% x >, x >% x
A xx x x X x
 xx xx

 XXXX XXX x
XXX X XXXX X X X



 X X XXXX X X X X
 I Xxxx X X X X



 XXXX XXXX
 X X X XXXXXX X X X
 .. x. x x XX x x x x x


fi

f21
g21
f3!
t3i
S}2
f?22
f32

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