Two little boys are at the Hartman Prehistoric Center.
Two little boys sad to be at a museum.
We don't know that they were sad or that the Hartman Prehistoric Center is a museum.
exists p1 s1 x1 x2 x3 x4.(ne_org_center(x2) & (x2 = x4) & ne_org_prehistoric(x4) & (x2 = x3) & ne_org_hartman(x3) & at(x1,x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1) & card_eq_2(x1))
exists p1 s1 s2 x1 x2.(a_topic(x1) & Topic(s2,p1) & Actor(s2,x2) & a_sad(s2) & exists p2 x3.(at(x2,x3) & n_museum(x3)) & (x1 = x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1) & card_eq_2(x1))