A group of people sitting down and walking around a large rock park.
A group of people are having a picnic.
Not all people who walk around a rock park are having a picnic.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & around(e2,x5) & n_park(x5) & of(x5,x6) & n_rock(x6) & a_large(s2) & Theme(s2,x5) & Actor(e2,x4) & v_walk(e2) & (x1 = x4) & a_down(s1) & Manner(e1,s1) & Actor(e1,x3) & v_sit(e1) & (x1 = x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_picnic(x3) & of(x1,x2) & n_people(x2) & n_group(x1))