6-12 A sequential circuit has two JK flip-flops, A and B; two inputs, x and y; and one output, z. The flip-flop input functions and the circuit output function are as follows: JA = Bx + B'y' KA - B'xy' JB - A'x KB = A + xy' z = Axy + Bx'y' (a) Draw the logic diagram of the circuit. (b) Tabulate the state table. (c) Derive the next-state equations for A and B