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, if z_4 plays squash, then z_4 is curious. Robert is not curious. For all z_4, z_4 will play squash if and only if z_4 is curious.
For all z_4, if z_4 plays squash, then z_4 is curious. For all z_4, if z_4 were curious, then z_4 is playing squash.