anchor.diff:  Duncan Graham,
   Duncan Haldane,33
   Duncan J. Watts,142
  -Duncan K. Foley,
  +Duncan K. Foley,181
   Duncan M. Y. Sommerville,
   Durmus A. Demir,81
   Dusa McDuff,
  
positive.code: Charles Schuchert,303
  Charles Scott Haley,
  Charles Scott Sherrington,
  Charles Scriver,
  Charles Spearman,
  Charles Speziale,
  Charles Stark Draper,
  
negative.code: Hedley Marston,51
  Hedvig Hricak,
  Hee-Sup Shin,270
  Heidi Hammel,139
  Heike Kamerlingh Onnes,
  Heiko Harborth,
  Heinrich Chantraine,80
  