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  1. or download this
    my $ref = [];
$ref->[0] = { id => 'a' };
$ref->[1] = { id => 'b' };
$ref->[2] = { id => 'c' };
$ref->[3] = { id => 'b' };
  2. or download this
    $ref->[0] = { id => 'a' };
$ref->[1] = { id => 'b' };
$ref->[2] = { id => 'c' };