Some people are on a patio and there is a fire.
People are outside.
If people are on a patio then they must be outside, as patios are outside.
exists p1 p2 x1 x2.(exists x4.((x2 = x4) & n_fire(x4)) & exists x3.(on(x1,x3) & n_patio(x3)) & n_people(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_people(x1))