What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, if x_13 were rich, then x_13 is an artist. Barbara is playing squash or Jessica is not rich. For all x_13, if x_13 were an artist, then x_13 is rich.
If Jessica were rich, then Barbara is playing squash. For all x_13, x_13 is rich if and only if x_13 is an artist. For all x_13, x_13 is an artist if and only if x_13 is rich.