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Given the the follwoing program with two threads:

Modify the threads to avoid race condition by using wait $0$ and signal $0.$ Define needed semaphores

Show sequence of execution and result after threads are complete.

The semaphore methods wait and Signal$()$ must be atomic to ensure a correct implementation of mutual exclusion. Use an execution sequence to show that if wait$()$ is not atomic then mutual exclusion cannot be maintained. Provide an execution sequence to present your answer.