A man scratching his arm while a girl sits at a table.
The girl is scratching the mans arm.
There can be either a man scratching his arm or the girl scratching the mans arm.
exists e1 p1 x1 x2 x3.(a_topic(x1) & exists e2 x4 x5.(at(e2,x5) & n_table(x5) & Actor(e2,x4) & v_sit(e2) & n_girl(x4)) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_scratch(e1) & n_arm(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_arm(x2) & of(x2,x3) & n_man(x3) & n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_scratch(e1))