***** NOT A TEACHER *****
Good morning from sunny California!
I have not found the answer, but I have found some items that may interest you.
1. One source* says that REPETITION is "an instance of using a word, phrase, or clause more than once in a short passage -- dwelling on a point." [dwell on a point = to focus attention on a point.]
a. This source gives this example from 1970's England:
Spam, spam, spam, spam. Lovely spam! Wonderful spam!
[Spam is a meat product. I love it!]
2. Another source ** says that repetition is used to repeat "for emphasis or to slow a moment." Its example is: And he thought and thought and thought about them.''
It is also used for emphasis and lyricism: Hello Hello Hello / Cold Cold Cold. ["lyricism" = enthusiasm , especially when unrestrained and exaggerated. Reference: Random House Webster's Unabridged Dictionary.]
3. Another source*** gives this example of repetition: Everywhere I looked, there were children, children. (I believe the source feels this example of repetition "indicates extent.")
4. Finally, another source**** reminds us of a repetition that is used by many native speakers:
There are teachers and there are teachers. = There are good teachers, and there are bad teachers.
a. Here is my bad example:
Tom: Are you voting tomorrow?
Mona: No. All politicians are the same.
Tom: Well, there are politicians and there are politicians. I think that you should really vote tomorrow.
[ = There are good politicians and there are bad politicians. Contrary to how you may feel, you should vote tomorrow.]
James
* Mr. Richard Norquist's grammar advice website.
** Mesdames Susan Ehmann and Kellyann Gayer, I Can Write Like That! (Google books).
*** Professor Quirk (and colleagues), A Comprehensive Grammar of the English Language (1985), page 1,441.
**** Professors Quirk and Greenbaum, A Concise Grammar of Contemporary English (1973), page 275.