Group of people sit on the sidewalk to take photographs together.
There are people in a photography class.
Just because group of people sit on the sidewalk to take photographs together does not indicate that there are people in a photography class.
exists e1 p1 x1 x2 x3 x4 x5.(n_sidewalk(x5) & ne_org_group(x3) & ne_org_group(x1) & Topic(e1,p1) & exists e2 s1 x6.(a_together(s1) & Manner(e2,s1) & Theme(e2,x6) & Actor(e2,x1) & v_take(e2) & n_photograph(x6)) & on(e1,x5) & Actor(e1,x3) & v_sit(e1) & of(x3,x4) & n_people(x4) & of(x1,x2) & n_people(x2))
exists p1 s1 x1 x2.(in(p1,x2) & n_class(x2) & a_photography(s1) & Theme(s1,x2) & exists x3.((x1 = x3) & n_people(x3)))