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C:\test>dir junk47.dat.*
26/10/2012  17:04        16,266,705 junk47.dat.1
...
my $start = time;
my( $n, $t, @l ) = process_flist( 'junk47.dat', $L ) for map "junk47.d
+at.$_", 1.. $N;
printf "%.3f\n", time() - $start;

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```
C:\test>junk47 -N=100 -L=20
147.615
```