A store is open at nighttime.
A store is open.
A store has a certain distinctive set of hours, from which it is open for business or closed for the remaining day/night.
exists s1 x1 x2.(at(s1,x2) & n_nighttime(x2) & Theme(s1,x1) & a_open(s1) & n_store(x1))
exists s1 x1.(Theme(s1,x1) & a_open(s1) & n_store(x1))