Using only two 4-bit adders construct a circuit to compute the expression 3x + 2y + z where x is a 2-bit number (x0 and x1), y is a 2-bit number (y0 and y1), and z is a 1-bit number (z0). The 4-bit adders are similar to those you designed for assignment #5 with two 4-bit numbers and a carry as inputs and a 4-bit sum as output. Make sure to clearly label all inputs and outputs.