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  1. or download this
    use Hash::Ordered;
use MCE::Shared::Ordhash;
...
my $h3 = Hash::Ordered->new( @pairs );
my $h4 = MCE::Shared::Ordhash->new( @pairs );
  2. or download this
    my $oh = MCE::Shared::Ordhash->new();

...
$oh->{hello} = "there";  # on-demand hash-like dereferencing
$oh->assign( @pairs );
  3. or download this
    use Hash::Ordered;

...
my $h2  = Hash::Ordered->new(qw( title1 foo title2 bar title3 baz ));
my @labels2 = $h2->keys;