contexts c1 and c2 are active, then any of the following 4 types of intents are candidates • no input context • input context c1 • input context c2 • input context c1 and c2 • what if there is an intent with input context c1 and c3? • it is not a candidate for selection, since c3 is not active
power set of the set of active contexts • Suppose c1, c2 and c3 are active: • the powerset is {(), (c1), (c2), (c3), (c1,c2), (c1,c3), (c2,c3), (c1,c2,c3)} • 8 = 2 ^ 3 combinations • Generally, 2 ^ N combinations