Several people are sitting at a table looking at colored index cards.
People are looking at index cards.
Several people indicate people in general and they are looking are index cards in both sentences.
exists e3 e2 e1 s1 x1 x2 x3 x4.(for(e1,e2) & at(e2,x3) & n_card(x3) & of(x3,x4) & n_index(x4) & Theme(e3,x3) & v_color(e3) & Actor(e2,x1) & v_look(e2) & at(e1,x2) & n_table(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(at(e1,x2) & n_card(x2) & of(x2,x3) & n_index(x3) & Actor(e1,x1) & v_look(e1) & n_people(x1))