What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, x_10 is a musician if and only if x_10 is an office clerk. For all x_10, x_10 is not an office clerk. For all x_10, if x_10 were a bartender, then x_10 is writing a letter. There is at least one x_10 for which if x_10 writes a letter, then x_10 is a bartender. For all x_10, x_10 is a bartender if and only if x_10 is a musician.
There is at least one x_10 for which x_10 will write a letter if and only if x_10 is a bartender. There is at least one x_10 for which x_10 is a bartender if and only if x_10 will write a letter. For all x_10, if x_10 were a musician, then x_10 is an office clerk. For all x_10, if x_10 were a bartender, then x_10 is a musician. For all x_10, if x_10 were an office clerk, then x_10 is a musician. For all x_10, if x_10 were a musician, then x_10 is a bartender. For all x_10, x_10 is not a musician.