Four ferry boats are docked at a visitor's center with passengers waiting to board.
The boats are in the water.
boats are in four in number and resembles as ferry
exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(at(e1,x4) & with(x4,x5) & to(e2,x7) & n_board(x7) & Actor(e2,x6) & v_wait(e2) & (x5 = x6) & n_passenger(x5) & n_center(x4) & of(x4,x3) & n_visitor(x3) & Theme(e1,x1) & v_dock(e1) & n_boat(x1) & of(x1,x2) & n_ferry(x2) & card_eq_4(x1))
exists p1 x1 x2.(n_water(x2) & n_boat(x1) & in(x1,x2))