anchor.diff:  John Johnston Oneill,
   John Komlos,376
   John L. Hall,
  -John L. Holland,
  +John L. Holland,252
   John Lawrence,
   John Lennard-Jones,
   John Lewis Gaddis,
  
positive.code: Sydney Selwyn,
  Syed Akhtar Ahsan,0
  Syed Mahmood Naqvi,2
  Syed Zahoor Qasim,
  Sylvain Cappell,
  Sylvester James Gates,
  Syun-Ichi Akasofu,
  
negative.code: Daniel Swern,
  Daniel T. Willingham,
  Daniel Walls,
  Daniel Wegner,325
  Daniele Trinchero,225
  Danielle Fong,
  Darleane Hoffman,145
  Darrell A. Posey,
  