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_5, x_5 is an astronaut or x_5 is a sailor. For all x_5, if x_5 were a carpenter, then x_5 is listening to a song. There is at least one x_5 for which x_5 is not a sailor or x_5 will work. For all x_5, if x_5 works, then x_5 is listening to a song. For all x_5, x_5 is not an astronaut or x_5 is a carpenter.
For all x_5, x_5 is a sailor or x_5 is a carpenter can be inferred via the universal resolution rule.