A man performs repairs on a public transportation system.
A man is cooking hamburgers.
A man cannot perform repairs while cooking hamburgers.
exists e1 s1 x1 x2 x3 x4.(on(e1,x3) & n_system(x3) & of(x3,x4) & n_transportation(x4) & a_public(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_repair(x2) & n_man(x1))
exists p1 x1.(exists s1 x2.((x1 = x2) & n_hamburger(x2) & a_cooking(s1) & Theme(s1,x2)) & n_man(x1))