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#!/opt/perl5/bin/perl -w

...
        print "\nIncorrect selection.  Try again.\n";
    } else { $j = 1; }
}

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Available Instances
===================
...
j is: 1
Use of uninitialized value in concatenation (.) or string at ./opSet.p
+l line 28, <> line 1.
Use of uninitialized value in string at ./opSet.pl line 32, <> line 1.