>>> from contact_book import make_contact_book_reps

>>> l = [["maria","931111111"], ["pep","912222222"], ["anna","93919391"],
... ["pep","66477333"], ["maria","665322888"]]
>>> d = make_contact_book_reps(l)
>>> if d != {"maria":["931111111","665322888"], "pep":["912222222","66477333"],
... "anna":["93919391"]}:
...    print(d)