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use strict;
use warnings;
...
        print "'$cheese' ";
}
print "\n";

@cisnet:~/kodzo_perl/chapter3$ perl example.pl

...
        Global symbol "%snacks" requires explicit package name (did yo
+u forget to declare "my %snacks"?) at example.pl line 12.
        Global symbol "%snacks" requires explicit package name (did yo
+u forget to declare "my %snacks"?) at example.pl line 17.
        Execution of example.pl aborted due to compilation errors.