What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Thomas is not climbing a mountain. If Thomas climbs a mountain, then Sarah is drinking water. If Sarah drinks water, then Thomas is climbing a mountain. For all x_9, x_9 is happy if and only if x_9 will drink water.
Sarah is not drinking water. For all x_9, if x_9 were happy, then x_9 is drinking water. For all x_9, if x_9 drinks water, then x_9 is happy.