premise: A clerk at a store is idling a waiting for next customer.
hypothesis: Clerk is busy ringing up products.
explanation_1: The clerk can't be waiting for the next customer and busy ringing up products at the same time.
explanation_2: A Clerk can not be idle and busy at the same time.
explanation_3: A clerk cannot have customers or not. A clerk cannot be waiting and ringing up products at the same time.
premise_logic: exists e1 s1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_idle(e1) & for(x3,x4) & n_customer(x4) & a_next(s1) & Theme(s1,x4) & n_waiting(x3) & at(x1,x2) & n_store(x2) & n_clerk(x1))
hypothesis_logic: exists e1 p1 x1.(ne_nam_clerk(x1) & exists e2 s1 x2.(a_up(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_ring(e2) & n_product(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_busy(e1))