Making Decisions Over and Over Again with Perl"s if and while

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Page 99 - TATAbox
Page 105 - acidicAA
Page 110 - GCrich
Page 112 - count_GC_rich_4mers
Page 113 - sum_AT_rich_lengths
Page 153 - acidicAA
Page 154 - divByZero
Page 158 - countDown