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 z, z is a scientist. There is at least one z for which z will play squash.
There is at least one z for which z will play squash and z is a scientist can be inferred via the existential conjunction rule. Some scientists will play squash can be inferred via the existential conjunction rule.