Group of people sit on the sidewalk to take photographs together.
There are people taking pictures of eachother.
It can be assumed that if the people are taking photographs together, they are also taking pictures of each other.
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 x1 e1 x2 x3 x4 x5.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_take(e1) & of(x4,x5) & n_eachother(x5) & n_picture(x4) & (x2 = x3) & n_people(x2))