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_13 for which x_13 will sleep and x_13 is a sailor. For all x_13, x_13 is a mechanic or x_13 is a poet. For all x_13, if x_13 were a mechanic, then x_13 is running. For all x_13, if x_13 were a poet, then x_13 is running.
There is at least one x_13 for which x_13 will sleep can be inferred via the existential simplification rule. There is at least one x_13 for which x_13 is a sailor can be inferred via the existential simplification rule. For all x_13, x_13 will go running can be inferred via the universal disjunction elimination rule.