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At 31:50 in the video, the professor said "It is under the six. It is absolutely impractical." And later at 31:54 he told a joke where he also mentioned "under the six". But I have searched the google and the Wikipedia, only to find that such a phrase doesn't exist. Thus I think I recognized the speech wrongly. Could anybody who can recognize it correctly(or has the knowledge background to recognize that ambiguous speech correctly) please tell me what it exactly is?

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    Not my area, but I think he's saying N to the six, in other words N to the power of six, where the variable N stands for any given number. – Araucaria - Not here any more. Jan 4 '17 at 9:48
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    @Araucaria Your recognition is much better than mine. That makes sense. – Lerner Zhang Jan 4 '17 at 9:56
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    @Araucaria I feel like your comment should have been an answer. – Teacher KSHuang Jan 4 '17 at 10:14
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As Araucaria has already pointed out, the spoken words are:

It's n to the six, which is absolutely impractical.

"n to the the six" means "n raised to the power six". What the speaker is saying is that any solution would have a complexity of O(n6). Since solutions with complexity of less than O(n2) are generally sought for to be computationally viable, O(n6) is hardly acceptable.

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He is saying

N6

which he goes on to say is an impractical number.

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    You might want to add how that is said in actual words. Then I can upvote your answer! – Araucaria - Not here any more. Jan 4 '17 at 11:50
  • That's exactly what I am waiting for. But it seems that for listening issues StackExchange is not the best place to explain. – Lerner Zhang Jan 4 '17 at 11:54

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