What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Susan is not a soldier. Susan is writing a letter or Joseph is running. For all x_7, x_7 is a soldier if and only if x_7 will write a letter.
For all x_7, if x_7 were a soldier, then x_7 is writing a letter. For all x_7, if x_7 writes a letter, then x_7 is a soldier.