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"my" variable @b masks earlier declaration in same scope at interact_p
+erturb.pl line 56.
"my" variable @b masks earlier declaration in same scope at interact_p
+erturb.pl line 60.
...
Global symbol "@a" requires explicit package name at interact_perturb.
+pl line 52.
Missing right curly or square bracket at interact_perturb.pl line 64, 
+at end of line
Execution of interact_perturb.pl aborted due to compilation errors.

#!/usr/bin/perl
use strict;
use warnings;
...
        }
    }