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Examples for support purposes...

J = J0(45)
J

Abelian variety J0(45) of dimension 3
C = J.cuspidal_subgroup()
C

Finite subgroup with invariants [2, 4, 8, 8] over QQ of Abelian variety J0(45) of dimension 3
J.rational_cuspidal_subgroup()

Finite subgroup with invariants [2, 4, 8] over QQ of Abelian variety J0(45) of dimension 3