Several people in a catamaran are struggling with the wind while another boat is nearby.
There are people in a catamaran.
If there are several people, then there are definitely people.
exists e1 p1 s1 x1 x2 x3 x4.(n_boat(x4) & n_wind(x3) & exists s2 x5.(Theme(s2,x5) & a_nearby(s2) & n_boat(x5) & -(x5 = x4)) & while(e1,p1) & with(e1,x3) & Actor(e1,x1) & v_struggle(e1) & in(x1,x2) & n_catamaran(x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1 x2.(in(p1,x2) & n_catamaran(x2) & exists x3.((x1 = x3) & n_people(x3)))