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$hashref->{'globalkey'}->{'key2'}->{'key3'}->{'key4'}='ARRAY VALUE';
$hashref->{'globalkey'}->{'key2'}->{'key3'}->{'key4'}->{'key5'}='ARRAY
+ VALUE';
...
                                     }
                         }
        };

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use strict;
use warnings;

...
$hashref->{'globalkey'}->{'key2'}->{'key3'}->{'key4'}->{'key5'}->{'any
+ arbitrary number of keys'}='ARRAY VALUE';
__END__
Can't use string ("ARRAY VALUE") as a HASH ref while "strict refs" in 
+use at - line 6.