def _duplicated_isinstance_types(node):
        """Get the duplicated types from the underlying isinstance calls.

        :param astroid.BoolOp node: Node which should contain a bunch of isinstance calls.
        :returns: Dictionary of the comparison objects from the isinstance calls,
                  to duplicate values from consecutive calls.
        :rtype: dict
        """
        duplicated_objects = set()
        all_types = collections.defaultdict(set)

        for call in node.values:
            if not isinstance(call, astroid.Call) or len(call.args) != 2:
                continue

            inferred = utils.safe_infer(call.func)
            if not inferred or not utils.is_builtin_object(inferred):
                continue

            if inferred.name != "isinstance":
                continue

            isinstance_object = call.args[0].as_string()
            isinstance_types = call.args[1]

            if isinstance_object in all_types:
                duplicated_objects.add(isinstance_object)

            if isinstance(isinstance_types, astroid.Tuple):
                elems = [
                    class_type.as_string() for class_type in isinstance_types.itered()
                ]
            else:
                elems = [isinstance_types.as_string()]
            all_types[isinstance_object].update(elems)

        # Remove all keys which not duplicated
        return {
            key: value for key, value in all_types.items() if key in duplicated_objects
        }
Get the duplicated types from the underlying isinstance calls.

        :param astroid.BoolOp node: Node which should contain a bunch of isinstance calls.
        :returns: Dictionary of the comparison objects from the isinstance calls,
                  to duplicate values from consecutive calls.
        :rtype: dict