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  1. or download this
    use strict;
use warnings;
...
use constant HASHREFCONST => [$hashref->{ONE} .. $hashref->{FOUR}]; 

print Dumper(HASHREFCONST);
  2. or download this
    Use of uninitialized value in range (or flop)
Use of uninitialized value in range (or flop)
  3. or download this
    my @test = ($hashref->{ONE} .. $hashref->{TWO});
use constant GOODCONSTANT  => \@test;