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#!/usr/bin/perl -w
use strict;
...
DComp:  2 wallclock secs ( 1.42 usr + 0.00 sys =  1.42 CPU)
 grep: 13 wallclock secs (13.13 usr + 0.00 sys = 13.13 CPU)
  faq:  1 wallclock secs ( 0.55 usr + 0.00 sys =  0.55 CPU)

my @first = ((1..200), qw(a b c d e f)) ;
my @second= ((1..200), qw(b a c d e f)) ;
...
DComp: 12 wallclock secs (11.52 usr + 0.00 sys = 11.52 CPU)
  faq:  2 wallclock secs ( 1.48 usr + 0.00 sys =  1.48 CPU)
 grep:  1 wallclock secs ( 1.35 usr + 0.00 sys =  1.35 CPU)