Homework 11 - due on Dec 4, 2006 in recitation.
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    8.3: # 12, 16, 24, 30. 
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    8.4: # 7, 8, 13, 32.
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    8.5: # 3, 8, 13, 18.
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    8.6: # 5, 8, 11, 16.