A kayaker traverses some churning rapids.
A person is shopping in the mall.
one cannot be in a mall shopping whilst be in a kayaker boat.
exists e2 e1 x1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_traverse(e2) & n_rapid(x2) & Actor(e1,x2) & v_churn(e1) & n_kayaker(x1))
exists p1 x1 x3.(n_mall(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_shopping(x2)) & n_person(x1))