A man in a blue shirt is cooking hamburgers on a grill.
A man in a purple shirt is making a vegetarian lunch.
the man is wearing either a blue shirt or a purple one
exists p1 s1 x1 x2.(exists s2 x3 x4.((x1 = x3) & on(x3,x4) & n_grill(x4) & n_hamburger(x3) & a_cooking(s2) & Theme(s2,x3)) & in(x1,x2) & n_shirt(x2) & a_blue(s1) & Theme(s1,x2) & n_man(x1))
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_make(e1) & n_lunch(x3) & a_vegetarian(s2) & Theme(s2,x3) & in(x1,x2) & n_shirt(x2) & a_purple(s1) & Theme(s1,x2) & n_man(x1))