Two people riding their bikes on a hill.
Two goldfish are riding bikes in a pile of mashed potatoes.
Goldfish are not people. A pile of mashed potatoes is not a hill.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_hill(x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & of(x3,x1) & n_thing(x1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3 x4.(in(e1,x3) & of(x3,x4) & n_potato(x4) & a_mashed(s1) & Theme(s1,x4) & n_pile(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_goldfish(x1) & card_eq_2(x1))