A circuit with two outputs has to implement the following functions:
\(f(a,b,c,d)= \sum_m (3,4,8,13)+D(2,5,9) \)
\(g(a,b,c,d)= \sum_m (2,3,4,10,11,15)+D(8,12) \)
Design the minimum-cost circuit and compare its cost with combined costs of two circuits that implement f and g separately. Assume that the input variables are available in both uncomplemented and complemented forms.