People working together fill wheelbarrows at a playground.
People are outside.
Being a playground implies they are outside.
exists e1 e2 s1 x1 x2 x3 x4.(at(e2,x4) & n_playground(x4) & Theme(e2,x3) & Actor(e2,x1) & v_fill(e2) & n_wheelbarrow(x3) & a_together(s1) & Manner(e1,s1) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_people(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_people(x1))