Three lambs are in a field.
The lambs are outside.
If the lambs are in the field, then they are outside.
exists p1 x1.(exists x2.(in(x1,x2) & n_field(x2)) & n_lamb(x1) & card_eq_3(x1))
exists s1 x1.(n_lamb(x1) & Theme(s1,x1) & a_outside(s1))