A group of people are taking pictures with their phones.
The group used an SLR to take a photo.
The pictures were either taken with the people's phones, or they used an SLR.
exists e1 x1 x2 x3 x4.(with(e1,x4) & n_phone(x4) & of(x4,x1) & n_thing(x1) & Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_picture(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 p1 x1 x2.(n_group(x1) & Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_take(e2) & n_photo(x3)) & n_slr(x2))