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Given the points scored by each by each team in a set of games,
we want to find a RATING( j) for each team j, so that
if RATING( j) > RATING( k) then it is highly likely that
team j will beat team k in a future game.
 Ref: Amy N. Langville & Carl. D. Meyer (2012), 
  "Who's #1," Princeton University Press ;