Runners are passing by a red and white lighthouse.
A group of runners wearing bibs passing a lighthouse.
It is not mandatory that runners should be wearing bibs.
exists e1 s1 s2 x1 x2.(by(e1,x2) & n_lighthouse(x2) & a_white(s2) & Theme(s2,x2) & a_red(s1) & Theme(s1,x2) & Actor(e1,x1) & v_pass(e1) & n_runner(x1))
exists e2 e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e2,x4) & Actor(e2,x3) & v_wear(e2) & Theme(e1,x6) & Actor(e1,x5) & v_pass(e1) & n_lighthouse(x6) & (x4 = x5) & n_bib(x4) & (x1 = x3) & of(x1,x2) & n_runner(x2) & n_group(x1))