'A helper function that instantiates BNCWordViews or the list of words/sentences.'

def _views(self, fileids=None, sent=False, tag=False, strip_space=True, stem=False):

    f = (BNCWordView if self._lazy else self._words)
    return concat([f(fileid, sent, tag, strip_space, stem) for fileid in self.abspaths(fileids)])
