U-Intermediate level of string puzzle OUT(2011-12-17)

Here I should take the chance to thank Professor IQ Ring, who uploaded his video about the solution to solve this kind of string puzzle.
Before I didn't know how to solve it, thanks to his great effort, I came to know the solution.
I like to share the happiness with the audience of solving this string puzzle and so I made this video of solving it. This following information is for your reference.
Title：Forty Ring-puzzle ( 德致情四十載）Solution
Link：www.youtube.com/watch?v=gz9aHGaFGRo

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[stringpuzzle]

Here I should take the chance to thank Professor IQ Ring(youtube.com/watch?v=gz9aH­GaFGRo), who uploaded his video about the solution to solve this kind of string puzzle, where he called it "Forty Ring-puzzle".

Before his video, I didn't know how to solve it, thanks to his great effort, I come to know the method now.

The following information is for your reference.

Title：Forty Ring-puzzle ( 德致情四十載）Solution

Link：youtube.com/watch?v=gz9aH­GaFGRo