Regarding the number of 7 as meaning perfection - think "complete", not "flawless". That would explain the 7 deadly sins, as a complete number of them, also the 7 palantíri, etc.
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth.. .'
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