Two people are at a park.
People are at a park.
scentence two is a simplified version of scentence one by saying people are at the park
exists p1 x1.(exists x2.(at(x1,x2) & n_park(x2)) & n_people(x1) & card_eq_2(x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_park(x2)) & n_people(x1))