Generates the keys in self.__personalLetterMap in ascending order.
# - - - A c c e s s S u m m a r y . g e n P e r s o n a l L e t t e r s
def genPersonalLetters(self):
'''Generate the first characters of personal accounts.
'''
#-- 1 --
for letter in sorted(self.__personalLetterMap.keys()):
yield letter
#-- 2 --
raise StopIteration