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```
#!/usr/bin/perl

...
        }
    }
}
```

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Attempt to free non-existent shared string '_XEvent_', Perl interprete
+r: 0x1ca69ac at c:/Perl/site/lib/Tk/Widget.pm line 98 during global d
+estruction.
Free to wrong pool 1ca6060 not 246f88 at c:/Perl/site/lib/Tk/Widget.pm
+ line 98 during global destruction.