A person kayaking in strong currents.
The canoer slowly rows on the placid lake.
A placid lake cannot have strong currents.
exists e1 s1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_current(x3) & a_strong(s1) & Theme(s1,x3) & Actor(e1,x2) & v_kayake(e1) & (x1 = x2) & n_person(x1))
exists x1 x2 x3 x4.(n_lake(x3) & of(x3,x4) & n_placid(x4) & n_canoer(x1) & a_topic(x1) & slowly(x1,x2) & on(x2,x3) & n_row(x2))