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, if y were bored, then y is a mechanic. For all y, y is bored if and only if y is a mechanic. For all y, y is not a mechanic.
For all y, y is not bored can be inferred via the universal modus tollens rule. For all y, if y were bored, then y is a mechanic can be inferred via the universal biconditional elimination rule. For all y, if y were a mechanic, then y is bored can be inferred via the universal biconditional elimination rule. For all y, y is not bored can be inferred via the universal biconditional elimination rule.