Four people are picking up trash in a field.
Some people work outside.
Four people can be rephrased some people and picking up trash in a field implies that they are outside
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_field(x3) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_pick(e1) & n_trash(x2) & n_people(x1) & card_eq_4(x1))
exists e1 s1 x1.(a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_people(x1))