Four students are sitting on the floor by a model volcano.
Four students are learning about volcanos.
Students can sit by a model volcano without learning about volcanos.
exists e1 x1 x2 x3 x4.(n_floor(x2) & by(e1,x3) & n_volcano(x3) & of(x3,x4) & n_model(x4) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_student(x1) & card_eq_4(x1))
exists e1 x1 x2.(about(e1,x2) & n_volcano(x2) & Actor(e1,x1) & v_learn(e1) & n_student(x1) & card_eq_4(x1))