Consider the following premises. forall y: T_2(y) <-> R(y). exists y: ~T_2(y). forall y: U_3(y) <-> R(y). Can we infer exists y: ~U_3(y) from them?
 From forall y: T_2(y) <-> R(y), exists y: ~T_2(y) we can infer exists y: ~R(y). Finally, from forall y: U_3(y) <-> R(y), exists y: ~R(y) we can infer exists y: ~U_3(y). Therefore, the answer is yes.