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    Benchmark: timing 30 iterations of REGEXP, SPLIT...
        REGEXP: 10 wallclock secs ( 9.73 usr +  0.25 sys =  9.98 CPU)
         SPLIT: 47 wallclock secs (47.20 usr +  0.28 sys = 47.48 CPU)
    
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    use strict;
    use Benchmark;
    
    ...
        }
        close FH or die "\n $file: $!\n";
    }