What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Jessica is writing a letter or it is late. For all x_18, x_18 will play squash if and only if x_18 will work. For all x_18, x_18 will not work. Jessica is writing a letter if and only if Robert is a soldier. For all x_18, x_18 will play squash if and only if x_18 is a soldier.
If Jessica writes a letter, then Robert is a soldier. If Robert were a soldier, then Jessica is writing a letter. For all x_18, if x_18 plays squash, then x_18 is working. For all x_18, if x_18 plays squash, then x_18 is a soldier. For all x_18, if x_18 works, then x_18 is playing squash. For all x_18, if x_18 were a soldier, then x_18 is playing squash. For all x_18, x_18 will not play squash.