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#! perl -slw
use strict;
...

printf STDERR "Took %.3f seconds for $count CIDRs\n",
    time() - $start;

0.0.0.0/12
    0.10.0.0/15 0.1.0.0/16 0.7.0.0/16 0.12.0.0/16 0.11.0.0/17 0.4.128.
+0/19 0.11.160.0/19 0.12.72.0/21 0.2.132.0/22 0.3.184.0/22 0.15.254.0/
+24 0.14.150.128/26
...
    
0.58.0.0/21
...

#! perl -slw
use strict;
...
    print $cidr;
}