I'm unable to get some magma output converted back into sage.  This
has to do with group invariants.  Here's a script that produces the
error

sage: G =magma(SymmetricGroup(5))
sage: x = G.InvariantsOfDegree(2)
sage: print x
[
x1^2 + x2^2 + x3^2 + x4^2 + x5^2,
x1*x2 + x1*x3 + x2*x3 + x1*x4 + x2*x4 + x3*x4 + x1*x5 + x2*x5 + x3*x5
+
x4*x5
]
sage: print x.sage()
NameError: name 'x1' is not defined

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