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push @{ $hash{"ef56"} }, {height => 2.6, color => 'red',  weight => 4}
+;
push @{ $hash{"ef56"} }, {height => 3.2, color => 'blue', weight => 5}
+;

foreach my $item (@{$hash{"ef56"}}) {
  print $item->{height}, ' ', $item->{color}, ' ', $item->{weight}, "\
+n";
}