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: Richard is not a scientist. Joseph is making tea if and only if Richard is reading a book. For all x_15, if x_15 reads a book, then x_15 is a scientist.
If Joseph makes tea, then Richard is reading a book can be inferred via the biconditional elimination rule. If Richard reads a book, then Joseph is making tea can be inferred via the biconditional elimination rule.