':param fileids: A list specifying the fileids that should be used.
:return: the given file(s) as a list of paragraphs, each encoded as a list
of sentences, which are in turn encoded as lists of word string
:rtype: list(list(list(str)))'

def paras(self, fileids=None):

    return concat([MTEFileReader(os.path.join(self._root, f)).paras() for f in self.__fileids(fileids)])
