Young man on a sofa fingers a large electronic keyboard device.
A man is on the sofa.
both sentences tell us that the man is on a sofa
exists s1 x1.(all s2 x2 s3 x3.((n_device(x2) & of(x2,x3) & n_keyboard(x3) & a_electronic(s3) & Theme(s3,x2) & a_large(s2) & Theme(s2,x2)) -> exists s4 x4.(a_topic(x1) & on(x1,x4) & for(x4,x2) & n_finger(x4) & a_sofa(s4) & Theme(s4,x4))) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_sofa(x2) & on(x1,x2) & n_man(x1))