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Accumulated Comments about HW4
  Important queries/clarification on the homework set
  will be made here.   --hon-wai
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Added: 9-Oct-2002

Corrections on S3:

  Two students checked with me on this --

  1. in the writeup, I forgot to mention a constraint 
     "at most one flag per country" 
    
  2. in part (b), there is a typo it should be
        1 <= s_j <= e_j <= n.
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Started: LeongHW; 26-Sep-02
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