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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _CalculateAttributeStorageTypes(self):
 """Build a mapping between column names and types."""

    self.attribute_types = {}

    for attribute in itervalues(aff4.Attribute.PREDICATES):
      self.attribute_types[attribute.predicate] = (
          attribute.attribute_type.data_store_type)