Ladder against a tree and rope harness being set up by a camp leader in front of campers.
Camp leader is lighting a fire
One can not being set up a harness and be lighting a fire  simultaneously.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8.(ne_nam_ladder(s1) & a_topic(s1) & against(s1,x1) & Actor(e1,x5) & in(x5,x7) & of(x7,x8) & n_camper(x8) & n_front(x7) & n_leader(x5) & of(x5,x6) & n_camp(x6) & a_up(s2) & Manner(e1,s2) & Theme(e1,x4) & v_set(e1) & (x1 = x4) & n_harness(x1) & of(x1,x3) & n_rope(x3) & of(x1,x2) & n_tree(x2))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_light(e1) & n_fire(x3) & n_leader(x1) & (x1 = x2) & ne_nam_camp(x2))