@journals.over('<STR_LIT>', '<STR_LIT>')<EOL>def deleted(self, key, value):
deleted = self.get('<STR_LIT>')<EOL>book_series = self.get('<STR_LIT>')<EOL>if not deleted:<EOL><INDENT>normalized_a_values = [el.upper() for el in force_list(value.get('<STR_LIT:a>'))]<EOL>normalized_c_values = [el.upper() for el in force_list(value.get('<STR_LIT:c>'))]<EOL>if '<STR_LIT>' in normalized_a_values or '<STR_LIT>' in normalized_c_values:<EOL><INDENT>deleted = True<EOL><DEDENT><DEDENT>if not book_series:<EOL><INDENT>normalized_a_values = [el.upper() for el in force_list(value.get('<STR_LIT:a>'))]<EOL>if '<STR_LIT>' in normalized_a_values:<EOL><INDENT>book_series = True<EOL><DEDENT><DEDENT>self['<STR_LIT>'] = book_series<EOL>return deleted<EOL>
Populate the ``deleted`` key.

    Also populates the ``book_series`` key through side effects.