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          Chapter 4 Good Problems

Sec. 4.1     5 , 6 , 9 , 10 , 19 , 20 , 25 , 31 , 36 , 37

Sec. 4.2     3 , 5 , 8 , 9 , 12 , 19

Sec. 4.3     3 , 4 , 5 , 11 , 15 , 16

Sec. 4.4     6