📝 **Question:** Implement `TokenBucket` with `allow()` returning True/False. Use a fake clock for deterministic tests. Capacity 3, rate 1 token/sec. Burst 3 calls immediately — all True. Then call once with no time elapsed — False. Then advance 1 second, call once — True. Print the four results. 📋 Pick the right answer. 💡 **Hint:** Re-read the theory above if unsure.