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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 loadMoreItems(self, excludeRead=False, continuation=None, loadLimit=20, since=None, until=None):
 """ Load more items using the continuation parameters of previously loaded items. """

        self.lastLoadOk     = False
        self.lastLoadLength = 0
        if not continuation and not self.continuation:
            return
        self._itemsLoadedDone(self._getContent(excludeRead, continuation or self.continuation, loadLimit, since, until))