>>> from city_dancers import ord_city_dancers_D

>>> d = {'BCN': ['Inma', 'Adamo'], 'St.Cugat': ['Zoe']}
>>> ord_city_dancers_D(d)
>>> d == {'BCN': ['Adamo', 'Inma'], 'St.Cugat': ['Zoe']}
True

>>> d = {'BCN': ['Inma', 'Eva', 'Adamo'], 'St.Cugat': ['Zoe', 'Xavier'], 'Unknown': ['666Z', '101A']}
>>> ord_city_dancers_D(d)
>>> d == {'BCN': ['Adamo', 'Eva', 'Inma'], 'St.Cugat': ['Xavier', 'Zoe'], 'Unknown': ['101A', '666Z']}
True

>>> d = {}
>>> ord_city_dancers_D(d)
>>> d == {}
True