Consider the following premises. R_1(e). Can we infer exists y: R_1(y) or S_2(y) from them? If possible, name the inference rules being used at each step.
 From R_1(e) we can infer exists y: R_1(y) via existential generalization. Finally, from exists y: R_1(y) we can infer exists y: R_1(y) or S_2(y) via existential addition. Therefore, the answer is yes.