A group of volunteers help build a house on behalf of Habitat for Humanity.
Tall beings building
Just because they're volunteers does not infer that they are tall beings. Volunteers can be any height.
exists e1 p1 x1 x2 x5 x6.(ne_org_humanity(x6) & ne_org_habitat(x5) & exists e2 x3 x4.(for(e2,x6) & on(e2,x4) & of(x4,x5) & n_behalf(x4) & Theme(e2,x3) & Actor(e2,x1) & v_build(e2) & n_house(x3)) & Topic(e1,p1) & Actor(e1,x1) & v_help(e1) & of(x1,x2) & n_volunteer(x2) & n_group(x1))
exists x1 x2 x3.(n_building(x1) & of(x1,x3) & n_being(x3) & (x1 = x2) & ne_nam_tall(x2) & a_topic(x1))