SEMAPHORES problem Please explain

Processes P1, P2, and P3 will execute concurrently process P1 while(1) wait(S1); print("A"); signal(S3) process P2: while(1) wait(S2); print("B") wait(S2): print("B") signal(S1); process P3: while(1) wait(S3); print("C") signal(S2); The processes are created simultaneously and begin to execute with initial semaphore values S1-0, S2 1, and S3-2. Consider if each of the following output sequences can occur: (enter either YES or NO for your answers) Is the output subsequence CBBA possible? Is the output subsequence CCBB possible? Is the output subsequence BCBA possible? Is the output subsequence BCCA possible? Is the output sequence CCBBBACBACB possible? Is the output sequence ACCBBACBACB possible? Is the output sequence BCCBBACBACB possible