What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_2, if x_2 plays tennis, then x_2 is making tea. Barbara is making tea if and only if Mary is playing squash. Mary is not playing squash. For all x_2, if x_2 makes tea, then x_2 is playing tennis.
If Barbara makes tea, then Mary is playing squash. If Mary plays squash, then Barbara is making tea. Barbara is not making tea. For all x_2, x_2 will play tennis if and only if x_2 will make tea. For all x_2, x_2 will make tea if and only if x_2 will play tennis.