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: There is at least one x_10 for which x_10 is a carpenter. For all x_10, x_10 is poor or x_10 will not play squash. For all x_10, x_10 is happy or x_10 is a sailor. For all x_10, if x_10 were a sailor, then x_10 is poor. For all x_10, if x_10 were happy, then x_10 is playing squash.
For all x_10, if x_10 plays squash, then x_10 is poor can be inferred via the universal rewriting rule.