What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? s -> q_2. w -> s_1. s_1 -> w. ~q_2. ~s_1.
~s. ~w. ~q_2 and ~s_1. ~s_1 and ~q_2. w <-> s_1. s_1 <-> w.