Three people sit on the end of a pier.
Three people do headstands on the end of the pier.
Three people are sitting and doing headstands on the end of the pier.
exists e1 x1 x2 x3.(n_end(x2) & on(e1,x2) & of(x2,x3) & n_pier(x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2 x3 x4.(n_pier(x4) & n_end(x3) & on(e1,x3) & of(x3,x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_headstand(x2) & n_people(x1) & card_eq_3(x1))