A group of people are looking through a microscope.
The group aren't looking through anything other than their naked eye
The people are either looking through a microscope or using only their eyes, but not both.
exists e1 x1 x2 x3.(through(e1,x3) & n_microscope(x3) & Actor(e1,x1) & v_look(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists s2 x1 x4.(n_eye(x4) & a_naked(s2) & Theme(s2,x4) & of(x4,x1) & n_thing(x1) & n_group(x1) & -exists e1.(all x2.(n_thing(x2) -> exists s1 x3.(through(e1,x2) & than(s1,x4) & Theme(s1,x3) & a_other(s1) & (x2 = x3))) & Actor(e1,x1) & v_look(e1)))