NM1rot0c K -iy NN0 r
to N r0 -- 0 H0 Z 1
x x >. >, ,., ,, >.: K. x -,.


b)
 fl1
 f21

 f12

 f22
 fs2


O000 011e0
0 N 8 0 N t 0oN N
x t >s >c x: x x x x f e x
X XX
X X iX X I

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 x x
 XX Xxx
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21 IX X
f3! -XXX-








FIGURE 2-3


EXPANDED INCIDENCE MATRIX


 00-
f X :X


N ck-
c3^":


fli
f21
fS1
f12
f22
f52
eil
g21
312

g22
g52


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 XX XX X XX XXX
 x %If r %

 XXXXXX XXX X



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 ,_,__ X XX Xx___x x x x _x|
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