What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_7, x_7 is an electrician. For all x_7, x_7 will write a letter. For all x_7, x_7 will read a book or x_7 is not an electrician.
For all x_7, x_7 is an electrician and x_7 will write a letter can be inferred via the universal conjunction rule. For all x_7, x_7 will write a letter and x_7 is an electrician can be inferred via the universal conjunction rule. For all x_7, if x_7 were an electrician, then x_7 is reading a book can be inferred via the universal rewriting rule.