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#!/usr/bin/perl -w
use strict;
...
Global symbol "$d" requires explicit package name at wrong.pl line 4.
Execution of wrong.pl aborted due to compilation errors.

#!/usr/bin/perl -w
use strict;
...
Global symbol "$e" requires explicit package name at wrong.pl line 3.
Global symbol "$d" requires explicit package name at wrong.pl line 4.
Execution of wrong.pl aborted due to compilation errors.