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    Global symbol "a1" requires explicit package name at practice/temp lin
+e 20.
Global symbol "a2" requires explicit package name at practice/temp lin
+e 28.
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    $VAR1 = [
          1,
...
Use of uninitialized value at practice/temp line 25.
Use of uninitialized value at practice/temp line 34.
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    use strict;
use Data::Dumper;
...
          print "$arg\n";
  }