A group of people are standing outside taking pictures.
Some people take pictures of each other.
Just because people are taking pictures does not necessarily mean they are taking pictures of each other. They could be taking pictures of beautiful things they want to remember seeing.
exists e2 e1 s1 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_take(e2) & n_picture(x3) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists x1 x2.(all x3.(n_other(x3) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & of(x2,x3))) & n_picture(x2) & n_people(x1))