Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.
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4-Strand Braid | Cuff bracelet | thick bangles | Crystal | How to make | DIY @LanAnhHandmade 706
Howtomake #Tutorial #LanAnhHandmade #Copperwire You can turn on subtitles by clicking the cc icon at the bottom of a YouTube ...
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