Consider the following premises. For all x_20, if x_20 plays squash, then x_20 is a nurse. For all x_20, if x_20 were a scientist, then x_20 is a nurse. There is at least one x_20 for which x_20 will play squash or x_20 is a scientist. For all x_20, x_20 is an electrician. Can we infer the following from them? There is at least one x_20 for which x_20 is an electrician or x_20 will work.
 From the fact that for all x_20, if x_20 plays squash, then x_20 is a nurse, that for all x_20, if x_20 were a scientist, then x_20 is a nurse, and that there is at least one x_20 for which x_20 will play squash or x_20 is a scientist we can infer that there is at least one x_20 for which x_20 is a nurse. From the fact that for all x_20, x_20 is an electrician, and that there is at least one x_20 for which x_20 is a nurse we can infer that there is at least one x_20 for which x_20 is an electrician and x_20 is a nurse. From the fact that there is at least one x_20 for which x_20 is an electrician and x_20 is a nurse we can infer that there is at least one x_20 for which x_20 is an electrician. Finally, from the fact that there is at least one x_20 for which x_20 is an electrician we can infer that there is at least one x_20 for which x_20 is an electrician or x_20 will work. Therefore, the answer is yes.