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 Mary were an office clerk, then Sarah is bored. For all x_9, x_9 is poor. If Joseph were fast, then Mary is an office clerk. If Joseph were poor, then Sarah is bored.
If Joseph were fast, then Sarah is bored can be inferred via the transitivity rule.