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_4, z_4 will make tea. There is at least one z_4 for which z_4 is a carpenter.
Some carpenters will make tea can be inferred via the existential conjunction rule. There is at least one z_4 for which z_4 will make tea and z_4 is a carpenter can be inferred via the existential conjunction rule.