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Can anyone make sense of fig 4.8?

$\hskip 0.5in$ knot

(Google books link.)

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If you're going to ask about a picture it'd be courteous to actually post it instead of simply link it. Moreover, which pages in a book GB allows one to preview can change from time to time, so such hyperlinks are temperamental. @percusse: Why did you edit out the link? – anon Nov 8 '11 at 22:05
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You are missing a verb in the question. Looks like if you pull the top loose end through the helix, you can rearrange to create a double helix. – user13838 Nov 8 '11 at 22:07
Sorry @anon . Looks like we have resonated for the image inclusion :) – user13838 Nov 8 '11 at 22:08
Did you get a loop of string and try for yourself? ;) – Tyler Nov 8 '11 at 22:18
Some color might help. Note the number of cross-overs between left and right side changes between the two. – anon Nov 8 '11 at 22:24
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