A group of ladies with computers sit behind a table while people on the other side purchase something.
A group of ladies with computers, looking at facebook pictures.
Sit behind a table does not mean looking at facebook pictures.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(-(x6 = x6) & n_purchase(x6) & of(x6,x8) & n_side(x8) & of(x6,x7) & n_side(x7) & a_something(s1) & Manner(e1,s1) & on(e1,x6) & while(e1,x5) & n_people(x5) & behind(e1,x4) & n_table(x4) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & with(x2,x3) & n_computer(x3) & n_lady(x2) & n_group(x1))
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & at(e1,x5) & n_picture(x5) & of(x5,x6) & n_facebook(x6) & Actor(e1,x4) & v_look(e1) & (x1 = x4) & of(x1,x2) & with(x2,x3) & n_computer(x3) & n_lady(x2) & n_group(x1))