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    a_file.txt sample:
http://www.ok.com/test_www.pdf       
...
http://www.ok.com/test_part.pdf       
http://www.ok.com/test_345.pdf       
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  2. or download this
    b_file.txt sample:
http://www.ok.com/test_www.pdf              
http://www.ok.com/test_part.pdf       
http://www.ok.com/test_345.pdf
  3. or download this
     
#!/usr/bin/perl

...

print $diffs;