What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 is a poet or x_12 is a carpenter. For all x_12, if x_12 were a musician, then x_12 is listening to a song. For all x_12, if x_12 listens to a song, then x_12 is happy. For all x_12, if x_12 were a carpenter, then x_12 is a musician. For all x_12, if x_12 were a poet, then x_12 is a musician.
For all x_12, if x_12 were a musician, then x_12 is happy. For all x_12, if x_12 were a carpenter, then x_12 is listening to a song. For all x_12, if x_12 were a poet, then x_12 is listening to a song. For all x_12, x_12 is a musician.