Young people sit on the rocks beside their recreational vehicle.
A group of young campers at Yosemite sit near their RV.
When young people are sitting on the rocks besides their recreational vehicle, it does not mean they are campers  at Yosemite in a group.
exists e1 s1 s2 x1 x2 x3.(n_vehicle(x3) & a_recreational(s2) & Theme(s2,x3) & of(x3,x2) & n_thing(x2) & n_rock(x2) & beside(e1,x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3 x4.(ne_geo_yosemite(x3) & near(e1,x4) & n_rv(x4) & of(x4,x1) & n_thing(x1) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & at(x2,x3) & n_camper(x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))