A group of people on a large boulder all wearing life vests.
A group of people on a large boulder all wearing life vests are going to go white rapid rafting
The boulder could be at the side of an ocean and the people are going on a whale watching cruise or boat trip, not necessarily white water rafting.
all x1 x2 x3 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 p1 s1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & all x5 x4 e1.((n_vest(x4) & of(x4,x5) & n_life(x5) & Actor(e1,x4) & v_wear(e1)) -> exists e2 p2.(Topic(e2,p2) & Actor(e2,x4) & v_go(e2) & exists e3 s2 s3 x6.(Theme(e3,x6) & Actor(e3,x4) & v_go(e3) & n_rafting(x6) & a_rapid(s3) & Theme(s3,x6) & a_white(s2) & Theme(s2,x6)))) & that(x3,p1) & n_boulder(x3) & a_large(s1) & Theme(s1,x3) & of(x1,x2) & n_people(x2) & n_group(x1))