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iterating over quotient ring and polynomial ring


I have been studied some finite algebraic structure as follows:

P.<v> = PolynomialRing(GF(2))
R.<v> = P.quotient((v^2-v))
T.<x> = PolynomialRing(R)

R is a quotient ring with elements : 0,1,v,1+v. I want to list all of the polynomials with degree 2. So I write:

for r in T.polynomials(of_degree=2): r

but the error is "object does not support iteration".

And also the same problem arises when I want to list the elements of R.

Is there any solution to this problem? How can I iterate over this structure?

thank you