Design a 4-bit serial equality comparator. That is, if we have a3a2a1a0 = b3b2b1b0, then eq = 1. Note that a3a2a1a0 is stored at register 1, while b3b2b1b0 is stored at register 2. You have to implement the same function using a serial equality comparator. You can assume that registers 1 and 2 can do shift function.