Students are carefully focused in one direction.
Students are reading their textbooks.
Students cannot be carefully focused in one direction and reading at the same time
exists e1 s1 x1 x2.(in(e1,x2) & n_direction(x2) & card_eq_1(x2) & a_carefully(s1) & Manner(e1,s1) & Theme(e1,x1) & v_focus(e1) & n_student(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_textbook(x2) & of(x2,x1) & n_thing(x1) & n_student(x1))