Two other methods of solution of this problem:
http://smartURL.it/P-7-8-6-2nd-Soln
http://smartURL.it/P-7-8-6-3rd-Soln
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Two other methods of solution of this problem:
http://smartURL.it/P-7-8-6-2nd-Soln
http://smartURL.it/P-7-8-6-3rd-Soln