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  | volume = 1
 
  | volume = 1
 
  | chapter number = 2
 
  | chapter number = 2
  | chapter title  =  
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  | chapter title  = Phenomena and forces
 
  | previous = v.1 ch.1
 
  | previous = v.1 ch.1
 
  | next    = v.1 ch.3
 
  | next    = v.1 ch.3