A group of people in green shirts push a cannon in a parade.
A group of people are pushing a cannon undercover in a parade.
Just because  A group of people in green shirts push a cannon in a parade does not mean they are undercover.
exists e1 s1 x1 x2 x3 x4 x5.(in(e1,x5) & n_parade(x5) & Theme(e1,x4) & Actor(e1,x1) & v_push(e1) & n_cannon(x4) & of(x1,x2) & in(x2,x3) & n_shirt(x3) & a_green(s1) & Theme(s1,x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4 x5.(in(e1,x5) & n_parade(x5) & Theme(e1,x3) & Actor(e1,x1) & v_push(e1) & n_undercover(x3) & of(x3,x4) & n_cannon(x4) & of(x1,x2) & n_people(x2) & n_group(x1))