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, if x_12 were a writer, then x_12 is a politician. For all x_12, if x_12 listens to a song, then x_12 is a politician. For all x_12, if x_12 were a mechanic, then x_12 is not a politician. For all x_12, x_12 is poor if and only if x_12 is a mechanic. For all x_12, x_12 will listen to a song or x_12 is a writer.
For all x_12, x_12 is a politician. For all x_12, if x_12 were poor, then x_12 is a mechanic. For all x_12, if x_12 were a mechanic, then x_12 is poor.