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: Susan is playing squash or Sarah is listening to a song. If Susan plays squash, then James is an artist. If Sarah listens to a song, then James is an artist. James is an artist if and only if Sarah is drinking water.
James is an artist can be inferred via the disjunction elimination rule. If James were an artist, then Sarah is drinking water can be inferred via the biconditional elimination rule. If Sarah drinks water, then James is an artist can be inferred via the biconditional elimination rule.