A store is open at nighttime.
The store is closed.
The store can either be open or closed.
exists s1 x1 x2.(at(s1,x2) & n_nighttime(x2) & Theme(s1,x1) & a_open(s1) & n_store(x1))
exists e1 x1.(n_store(x1) & Theme(e1,x1) & v_close(e1))