A guy and a girl are rock climbing with backpacks on.
A couple enjoys a picnic.
The couple cannot be rock climbing and on a picnic simultaneously.
exists e1 p1 s1 x1 x2 x3 x4.(for(p1,e1) & a_on(s1) & Manner(e1,s1) & with(e1,x4) & n_backpack(x4) & Actor(e1,x1) & v_climb(e1) & exists x5.((x1 = x5) & n_rock(x5)) & subset_of(x3,x1) & n_girl(x3) & subset_of(x2,x1) & n_guy(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & n_picnic(x2) & n_couple(x1))