What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_16, if x_16 listens to a song, then x_16 is a carpenter. For all x_16, x_16 will take a plane. John is playing tennis. For all x_16, x_16 is sad or x_16 will listen to a song. For all x_16, if x_16 were sad, then x_16 is a carpenter.
For all x_16, x_16 is a carpenter.