A person in a black top and bicycle helmet gestures while sitting on a bike.
A person on a bike is signaling.
The person is not necessarily signaling.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(while(x9,e1) & n_event(x9) & for(e1,x1) & in(e1,x4) & subset_of(x6,x4) & n_gesture(x6) & of(x6,x8) & n_helmet(x8) & of(x6,x7) & n_bicycle(x7) & subset_of(x5,x4) & n_top(x5) & a_black(s1) & Theme(s1,x5) & on(e1,x3) & n_bike(x3) & Actor(e1,x2) & v_sit(e1) & n_thing(x2) & n_person(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_signal(e1) & on(x1,x2) & n_bike(x2) & n_person(x1))