This is just a freeze/thaw way of getting back a structure which points at the same arrayref. If you built it like this:
%array = (
'a' => ['a','b','c','d'],
'b' => ['a','b','c','d'],
'c' => ['a','b','c','d'],
'd' => ['a','b','c','d']
);
you would have four different anonymous arrays, not four refencences to the same array, as the original code created.
Not sure if this answered your question, or if I even understood it, but there you go :).
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