The field is fenced in.
No one is allowed into the field.
Even though the field is fenced,  it does not necessity mean that no one can come inside fenced area.
exists e1 s1 x1.(n_field(x1) & a_in(s1) & Manner(e1,s1) & Theme(e1,x1) & v_fence(e1))
exists x2.(n_field(x2) & -exists e1 x1.(into(e1,x2) & Theme(e1,x1) & v_allow(e1) & n_one(x1)))