A group of people are at an aquarium to view marine life.
A group are at the aquarium on a tour.
The group of people are not necessarily on a tour.
exists p1 x1 x2.(exists p2 x3.(at(x1,x3) & Topic(x3,p2) & exists e1 s1 x4.(Theme(e1,x4) & Actor(e1,x3) & v_view(e1) & n_life(x4) & a_marine(s1) & Theme(s1,x4)) & n_aquarium(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1 x2.(n_aquarium(x2) & exists x3.(at(x1,x2) & on(x2,x3) & n_tour(x3)) & n_group(x1))