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 David were not a janitor, then Patricia is bored. For all x_14, x_14 will not work. Jennifer is working if and only if David is a janitor.
If Jennifer works, then David is a janitor can be inferred via the biconditional elimination rule. If David were a janitor, then Jennifer is working can be inferred via the biconditional elimination rule.