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class Mapping(dict):
def __getitem__(self, item):
try:
return super(Mapping, self).__getitem__(item)
except KeyError:
self[item] = []
return self[item]
class LowerList(list):
@staticmethod
def lower(n):
try:
return n.lower()
except AttributeError:
return n
def __contains__(self, value):
return self.lower(value) in map(self.lower, self)