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 and x_12 will sleep. For all x_12, if x_12 were a poet, then x_12 is sad. There is at least one x_12 for which if x_12 were sad, then x_12 is listening to a song. For all x_12, if x_12 listens to a song, then x_12 is an artist.
There is at least one x_12 for which if x_12 were sad, then x_12 is an artist. There is at least one x_12 for which if x_12 were a poet, then x_12 is listening to a song. For all x_12, x_12 is a poet. For all x_12, x_12 will sleep.