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B=BraidGroup(3) L=Link(B([1,1,1,2,-1,2])) L.homfly_polynomial()
L^-2*M^2 - L^-2 - L^-4*M^2 + L^-4 + L^-6
L.plot()
sage: B = BraidGroup(3) sage: K = Knot(B([-1,-1,-1,-1,-1,-1,-2,1,-2,-2]))
K.plot()