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```
use Data::Dumper;

...

    return;
}
```

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Use of uninitialized value in division (/) at pwm.pl line 26.
Illegal division by zero at pwm.pl line 26.
Attempt to free temp prematurely: SV 0x8f6a3f8, Perl interpreter: 0x8f
+53008.
Attempt to free unreferenced scalar: SV 0x8f6a3f8, Perl interpreter: 0
+x8f53008.