What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x for which if x drinks water, then x is working. For all x, x is happy or x will not write a letter. For all x, if x climbs a mountain, then x is drinking water. For all x, if x were happy, then x is climbing a mountain.
For all x, if x were happy, then x is drinking water. There is at least one x for which if x climbs a mountain, then x is working. For all x, if x writes a letter, then x is happy.