Can anyone recommend a good logic/critical thinking book?  I majored in Philosophy in college and have kept sharp by getting into computer programming, however, there is a lot of stuff I forgot from those college days.  I remember how quick my reasoning had become and I want to get there again.
I was hoping for a textbook/book that comes with a workbook or exercises.  Can you recommend some good readings?  Recommendations from a beginner to advanced level are welcome.  Thanks.        
                  
    
  
  
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