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: For all x_6, if x_6 were a scientist, then x_6 is drinking water. For all x_6, x_6 will not drink water or x_6 will sleep. There is at least one x_6 for which x_6 is a scientist.
There is at least one x_6 for which x_6 will drink water can be inferred via the existential modus ponens rule.