A young lady talking on her cellphone while sitting on steps.
The lady sits on the steps while she talks on her cellphone.
Talking on a cellphone while sitting on steps is the inverse but equal of sitting on steps while talking on cellphone.
exists e1 e2 s1 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & on(e2,x4) & n_step(x4) & Actor(e2,x2) & v_sit(e2) & on(e1,x3) & n_cellphone(x3) & of(x3,x1) & n_female(x1) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_lady(x1) & a_young(s1) & Theme(s1,x1))
exists e1 p1 x1 x2 x3.(n_cellphone(x3) & of(x3,x2) & n_female(x2) & n_female(x2) & n_step(x2) & n_lady(x1) & exists e2.(on(e2,x3) & Actor(e2,x2) & v_talk(e2)) & while(e1,p1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))