1. 
   Centers
   [Fourth Way] In G.I. Gurdjieff`s Fourth Way teaching, also known as The Work, centers or brains refer to separate apparatuses within a being that dictate its specific functions. There are three main centers: intellectual, emotional, and moving. These three centers in the human body are analo...
   Found op http://en.wikipedia.org/wiki/Centers_(Fourth_Way)
   
   
2. 
   Centers
   Playing positions in the middle of the backline (inside center and outside center).
   Found op http://www.encyclo.co.uk/local/21230
   
   
3. 
   centers
   1) Convergence points 2) Court figures 3) Focal points 4) Gretzky and ewing 5) Hubs 6) Midpoints 7) Some linemen
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/centers/1
   
   

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