Consider the following premises. For all x_6, x_6 will make tea or x_6 is not an electrician. For all x_6, x_6 will make tea if and only if x_6 is an electrician. Can we infer the following from them? For all x_6, x_6 is an electrician if and only if x_6 will make tea.
 From the fact that for all x_6, x_6 will make tea or x_6 is not an electrician we can infer that for all x_6, if x_6 were an electrician, then x_6 is making tea. From the fact that for all x_6, x_6 will make tea if and only if x_6 is an electrician we can infer that for all x_6, if x_6 makes tea, then x_6 is an electrician. Finally, from the fact that for all x_6, if x_6 were an electrician, then x_6 is making tea, and that for all x_6, if x_6 makes tea, then x_6 is an electrician we can infer that for all x_6, x_6 is an electrician if and only if x_6 will make tea. Therefore, the answer is yes.