Three people are waiting on a train platform.
Three people are waiting at a bus stop.
People can either wait on a train platform or a bus stop, not both.
exists e1 x1 x2 x3.(on(e1,x2) & n_platform(x2) & of(x2,x3) & n_train(x3) & Actor(e1,x1) & v_wait(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2 x3.(at(e1,x2) & n_stop(x2) & of(x2,x3) & n_bus(x3) & Actor(e1,x1) & v_wait(e1) & n_people(x1) & card_eq_3(x1))