For all pairs of reviewers such that both reviewers gave a rating to the same movie, return the names of both reviewers(reviewer_name1, reviewer_name2). Eliminate duplicates, don't pair reviewers with themselves, and include each pair only once. For each pair, return the names in the pair in alphabetical order.

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movie ( mID, title, year, director )

English: There is a movie with ID number mID, a title, a release year, and a director.

reviewer ( rID, name )

English: The reviewer with ID number rID has a certain name.

rating ( rID, mID, stars, ratingDate )

English: The reviewer rID gave the movie mID a number of stars rating (1-5) on a certain ratingDate.