What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_4, z_4 will play tennis if and only if z_4 will make tea. For all z_4, z_4 will play tennis or z_4 will not make tea.
For all z_4, if z_4 makes tea, then z_4 is playing tennis. For all z_4, if z_4 plays tennis, then z_4 is making tea. For all z_4, if z_4 makes tea, then z_4 is playing tennis.