Divide-&-Conquer (D&C) Based Design A 4-input OR-AND-INVERT gate (CAI) with inputs X3, X2, X1, Xo implements the function [(x3 + X2) (21 + xo)]', where + is the OR, is the AND and is the NOT or complement operation. An n-input OAI function foai(xn-1, ..., Xo), where assume that n is a power of 2, is defined as (Ili<>