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  NUMBER : TOBYINK       JOHNGG        
  NUMBER : RESULT  TIME  RESULT  TIME  
...
   39783 : NO  0.000057  NO  0.065555  
   47083 : NO  0.000230  NO  0.170125  
  199933 : YES 0.000346  YES 0.778786

use 5.010;
use strict;
...
    my $end = time();
    printf '%.06f  ', ($end - $start);
}