# - - - b u i l d C h o i c e s
def __buildChoices ( self ):
'''Define the initial word choices for each slot.
[ self.__cellMap and self.__slotMap are as invariants ->
self.__wordBank +:= choices for slots in
self.__slotMap that are consistent with any
clues in self.__cellMap ]
'''
See Section 25, “Puzzle.__buildSlotChoices(): Build the
initial set of choices for one slot”.
#-- 1 --
# [ slotList := slots in self, sorted ]
slotList = self.__slotMap.values()
slotList.sort()
#-- 2 --
for slot in self.__slotMap.values():
#-- 2 body --
# [ self.__wordBank +:= choices for slot that are
# consistent with any clues in self.__cellMap ]
self.__buildSlotChoices ( slot )