[6 marks] Consider the following combinational circuits:
(i)
F_(1)(x,y,z)=\Sigma (1,2,5,6)
F_(2)(x,y,z)=\Sigma (1,3)
F_(3)(x,y,z)=\Sigma (0,4,7)
(ii)
F_(1)(w,x,y,z)=\Sigma (0,4,6,10,12,14)
F_(2)(w,x,y,z)=\Sigma (2,3,4,8,11,15)
F_(3)(w,x,y,z)=\Sigma (0,2,9,13)
F_(4)(w,x,y,z)=\Sigma (10,11,14,15)
a16\times 4 ROM.