Consider the following premises. For all x_5, x_5 is an electrician if and only if x_5 is curious. For all x_5, x_5 is an electrician or x_5 will play a game. For all x_5, if x_5 were a sailor, then x_5 is curious. For all x_5, if x_5 plays a game, then x_5 is a sailor. Can we infer the following from them? There is at least one x_5 for which x_5 is not curious.
 From the fact that for all x_5, if x_5 plays a game, then x_5 is a sailor, and that for all x_5, if x_5 were a sailor, then x_5 is curious we can infer that for all x_5, if x_5 plays a game, then x_5 is curious. From the fact that for all x_5, x_5 is an electrician if and only if x_5 is curious we can infer that for all x_5, if x_5 were an electrician, then x_5 is curious. Finally, from the fact that for all x_5, if x_5 were an electrician, then x_5 is curious, that for all x_5, if x_5 plays a game, then x_5 is curious, and that for all x_5, x_5 is an electrician or x_5 will play a game we can infer that for all x_5, x_5 is curious, which contradicts that There is at least one x_5 for which x_5 is not curious. Therefore, the answer is no.