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_7, x_7 is fast or x_7 will go running. For all x_7, x_7 is not fast or x_7 is sad. For all x_7, if x_7 were sad, then x_7 is a sailor. For all x_7, if x_7 goes running, then x_7 is a sailor. For all x_7, x_7 is a taxi driver.
For all x_7, x_7 will go running or x_7 is sad can be inferred via the universal resolution rule.