Ok for those who were NOT paying attention. It is a single word. It is NOT therein, it is a word in the english language that contains ten words in succession WITHOUT scrambling the letters.
17. There is a seven-letter word in English that
contains eleven words without rearranging any of its
letters, "therein": the, there, he, in, rein, her,
here, ere, I, therein, herein.