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 y, y is a musician or y is a bartender. For all y, y will not make tea. For all y, y is a musician if and only if y will make tea.
For all y, if y were a musician, then y is making tea can be inferred via the universal biconditional elimination rule. For all y, if y makes tea, then y is a musician can be inferred via the universal biconditional elimination rule. For all y, y is not a musician can be inferred via the universal biconditional elimination rule.