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K = Qp(5, print_mode='digits')

C1=CartesianProduct(ZZ,Integers(4));C1

Cartesian product of Integer Ring, Ring of integers modulo 4

C2=CartesianProduct(C1,Z5);C2

Cartesian product of Cartesian product of Integer Ring, Ring of integers modulo 4, 5-adic Ring with capped relative precision 20

C2.is_ring();