A group of people on a large boulder all wearing life vests.
This group of people wearing life vests are sitting on the dock.
A group of people can only be sitting on a dock or a boulder, not both.
all x3 x2 x1 s1 x4.(((x1 = x2) & on(x2,x4) & n_boulder(x4) & a_large(s1) & Theme(s1,x4) & of(x2,x3) & n_people(x3) & n_group(x2)) -> exists e1 x5 x6 x7.(a_topic(x1) & Theme(e1,x6) & Actor(e1,x5) & v_wear(e1) & n_vest(x6) & of(x6,x7) & n_life(x7) & (x1 = x5)))
exists e1 e2 x1 x2 x3 x4 x5 x6.(n_dock(x6) & n_group(x1) & on(e2,x6) & Actor(e2,x1) & v_sit(e2) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_vest(x4) & of(x4,x5) & n_life(x5) & (x2 = x3) & n_people(x2))