What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_12 for which x_12 is not a police officer or x_12 will write a letter. For all x_12, if x_12 were happy, then x_12 is an office clerk. For all x_12, x_12 is a police officer or x_12 is happy. For all x_12, if x_12 were an office clerk, then x_12 is a bartender. For all x_12, if x_12 writes a letter, then x_12 is an office clerk.
For all x_12, if x_12 were happy, then x_12 is a bartender. For all x_12, if x_12 writes a letter, then x_12 is a bartender. There is at least one x_12 for which x_12 is happy or x_12 will write a letter.