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: There is at least one x_7 for which if x_7 were a writer, then x_7 is a bartender. For all x_7, x_7 will not work or x_7 will read a book. For all x_7, x_7 will read a book if and only if x_7 is a bartender. For all x_7, x_7 will work.
For all x_7, if x_7 reads a book, then x_7 is a bartender can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were a bartender, then x_7 is reading a book can be inferred via the universal biconditional elimination rule.