The grass in the field is short.
The grass is 20 feet tall.
20 feet is not short, it is very large
exists s1 x1 x2.(n_field(x2) & n_grass(x1) & Theme(s1,x1) & a_short(s1) & in(x1,x2))
exists s1 x1 x2.(n_grass(x1) & Time(s1,x2) & card_eq_20(x2) & r_foot(s1) & Theme(s1,x1) & a_tall(s1))