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use strict;
use warnings;
...
   three => 'Chapter 3: CCC',
};
say "We start with $chapters->{noe}";   # Compiler neither gives an er
+ror, nor a warning.

package chapters;
our $one = 'Chapter 1: AAA';
...
use strict;
use warnings;
say "We start with $chapters::noe";  # Compile time error.