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Surprisingly, as the error message says, some methods do not apparently work when some variable names are prefixes to others. Here's a nasty workaround
sage: R = PolynomialRing(QQ, [chr(i+ord('a')) for i in range(11)])
sage: R
Multivariate Polynomial Ring in a, b, c, d, e, f, g, h, i, j, k over Rational Field
sage: R.ideal(R.gen(0)).groebner_fan()
Groebner fan of the ideal:
Ideal (a) of Multivariate Polynomial Ring in a, b, c, d, e, f, g, h, i, j, k over Rational Field
... you'll have to get creative when you go past 26 variables, though!
