What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: John is reading a book or Linda is drinking water. If John reads a book, then Mary is climbing a mountain. Richard is driving a car. Mary is climbing a mountain if and only if Linda is drinking water.
If Mary climbs a mountain, then Linda is drinking water can be inferred via the biconditional elimination rule. If Linda drinks water, then Mary is climbing a mountain can be inferred via the biconditional elimination rule.