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+ 
+ Develop truth table for a system with three inputs a,b and c and four outputs w,x,y and z
+
+ Given conditions
+
+ a = 0: odd                   a = 1: even
+
+ b = 0: prime                 b = 1: not prime
+
+ c = 0: less than 8           c = 1: greater than or equal to 8
+
+ some input may never occur; the ouput is never all 0
+
+ Inputs   |     Outputs
+
+ A  B  C  |  W   X   Y   Z
+
+ 0  0  0  |  0   1   1   1
+
+ 0  0  1  |  1   1   0   1
+
+ 0  1  0  |  X   X   X   X
+
+ 0  1  1  |  1   1   1   1
+
+ 1  0  0  |  0   0   1   0
+
+ 1  0  1  |  X   X   X   X
+
+ 1  1  0  |  0   1   1   0
+
+ 1  1  1  |  1   1   1   0
+
+ The above table satisfies the given conditions.
+\ No newline at end of file