The Eureka Summer Holiday Puzzle - Knot theory!

Eurekas Bon Voyage series includes a lot of fun. Today I will start with the first puzzle of this series. The Summer Holiday looks sooo strange. Made to confuse you!

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The puzzle shown in this video is available here:
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https://bit.ly/2HVqkpT
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Download the free solution for this puzzle and print it:
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More cool puzzle shops I do recommend:

US:
https://bit.ly/2GXglAA
https://bit.ly/2J9eARK

Europe:
https://bit.ly/2Ik1QGK
https://bit.ly/2GpfN5w

Asia:
https://bit.ly/2pPHka0
https://bit.ly/2Ig6lBP

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Music:
Mandeville von Kevin MacLeod ist unter der Lizenz "Creative Commons Attribution" (https://creativecommons.org/licenses/...) lizenziert.
Quelle: http://incompetech.com/music/royalty-...
Interpret: http://incompetech.com/