A kayaker in a red kayak paddles as an orange kayak approaches from behind.
A kayaker in a purple kayak paddles as green kayak approaches from the side.
Answer A kayak cannot come from behind and side at the same time.
exists s1 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & in(x1,x2) & as(x2,x4) & from(x4,x7) & n_behind(x7) & n_approach(x4) & of(x4,x6) & n_kayak(x6) & of(x4,x5) & n_orange(x5) & n_paddle(x2) & of(x2,x3) & n_kayak(x3) & a_red(s1) & Theme(s1,x2) & n_kayaker(x1))
exists s1 s2 x1 x2 x3 x4 x5 x6.(n_side(x6) & a_topic(x1) & in(x1,x2) & as(x2,x4) & from(x4,x6) & n_approach(x4) & of(x4,x5) & n_kayak(x5) & a_green(s2) & Theme(s2,x4) & n_paddle(x2) & of(x2,x3) & n_kayak(x3) & a_purple(s1) & Theme(s1,x2) & n_kayaker(x1))