Edit - Removed some of my comments -- Sorry, my comments were harsher than I had intended.
Next time, it would be considerate if you disclose right up front that you are working on a homework problem. Tell us why you can't solve the problem, and we will provide hints, but not solutions.
From the forum rules:
While we are happy to serve as a resource for hints and for asking questions when you get stuck and need a little help, the Ubuntu Forums should not be thought of as a homework service. Please do not post your homework assignments expecting someone else to do it for you. Any such threads will be taken offline and warnings or infractions may be issued.
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