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: If Jennifer were a poet, then William is driving a car. For all y, if y works, then y is driving a car. William is working or Jennifer is a poet. For all y, if y drives a car, then y is working.
For all y, y will work if and only if y will drive a car can be inferred via the universal biconditional introduction rule. For all y, y will drive a car if and only if y will work can be inferred via the universal biconditional introduction rule.