premise: Children walk in the city.
hypothesis: The kids are riding bikes
explanation_1: Children (or kids) can be walking or riding bikes, not not both.
explanation_2: You can either be walking or riding bikes.
explanation_3: They cannot walk and be riding bikes at the same time.
premise_logic: exists e1 x1 x2.(n_city(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_child(x1))
hypothesis_logic: exists e1 x1 x2.(n_kid(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2))