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Subject: Re: Is there an meaning of '[[]]' in a list?
Date: Thu, 19 Nov 2015 12:36:46 +0100
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> I have question: Is there any difference between [[]] and []?
Yes.

[] - a list with zero elements. That is an empty list.
[[]] - A list with one element. (That element is an empty list.)

> [[]] can have deeper assignment and use than 
You can have it as deep as you want, if you have enough memory.