Address sequence:
(a). 0, 2, 4, 8, 10, 12, 14, 16, 0
(b). 1, 3, 5, 1, 3, 1, 3, 5, 3
Simulate a random replacement policy by flipping a coin. For example, "heads means to evict the first block in a set and "tails" means to evict the second block in a set. How many hits does this address sequence exhibit?