You have two errors that I notice with a quick pass through this. Control-Z does not send a process into the background. Control Z interrupts a process by sending a SIG_STOP. The processes is thereby "stopped" and in essence sitting idle. "bg" at this point would put this process (since it is at the top of your stack) into the background. The Control-Z and bg sections have this incorrectly stating that Control-Z will put a process into the background which is simply not true.
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