What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Richard is drinking water if and only if Jennifer is a scientist. If Jennifer were not a scientist, then Patricia is poor. Susan is a cashier if and only if Richard is drinking water. Susan is not a cashier.
If Richard drinks water, then Jennifer is a scientist. If Susan were a cashier, then Richard is drinking water. If Jennifer were a scientist, then Richard is drinking water. If Richard drinks water, then Susan is a cashier. Richard is not drinking water.