three riders stand around their horses in the mountains.
Three riders stand around with their pets outdoors.
pets is a rephrase of horses and outdoors is a rephrase of mountains
exists e1 x1 x2 x3.(n_mountain(x3) & around(e1,x2) & in(x2,x3) & n_horse(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_stand(e1) & n_rider(x1) & card_eq_3(x1))
exists e1 s1 x1 x2 x3.(with(e1,x2) & n_outdoors(x2) & of(x2,x3) & n_pet(x3) & of(x2,x1) & n_thing(x1) & a_around(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & n_rider(x1) & card_eq_3(x1))