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 x_6, if x_6 were a scientist, then x_6 is an office clerk. There is at least one x_6 for which x_6 will make tea. For all x_6, x_6 is a scientist. For all x_6, x_6 is a mechanic.
For all x_6, x_6 is an office clerk can be inferred via the universal modus ponens rule. For all x_6, x_6 is a scientist and x_6 is a mechanic can be inferred via the universal conjunction rule. For all x_6, x_6 is a mechanic and x_6 is a scientist can be inferred via the universal conjunction rule. There is at least one x_6 for which x_6 will make tea and x_6 is a scientist can be inferred via the existential conjunction rule. There is at least one x_6 for which x_6 will make tea and x_6 is a mechanic can be inferred via the existential conjunction rule. Some scientists will make tea can be inferred via the existential conjunction rule. Some mechanics will make tea can be inferred via the existential conjunction rule.