A boy crawls through a rock tunnel with his brother and father behind him.
The rock tunnel is very brightly lit.
it may not be brightly lit
exists e1 x1 x2 x3 x4 x5 x6.(through(e1,x2) & subset_of(x6,x2) & behind(x6,x1) & n_male(x1) & n_male(x1) & n_father(x6) & subset_of(x3,x2) & with(x3,x5) & n_brother(x5) & of(x5,x1) & n_tunnel(x3) & of(x3,x4) & n_rock(x4) & Actor(e1,x1) & v_crawl(e1) & n_boy(x1))
exists s1 x1 x2.(n_tunnel(x1) & of(x1,x2) & n_rock(x2) & r_very(s1) & r_brightly(s1) & Theme(s1,x1) & a_lit(s1))