anchor.diff:  "Cubitt, Allan",The Pool of Bethesda
   unknown,The Rehearsal
   unknown,The Revenger's Tragedy
  -unknown,The Rivals
  +"Sheridan, Richard Brinsley",The Rivals
   unknown,The Road to Mecca
   unknown,The Royal Family
  -unknown,The School for Scandal
  +"Sheridan, Richard Brinsley",The School for Scandal
   unknown,The Second Man
   unknown,The Show-Off
   "Hansberry, Lorraine",The Sign in Sidney Brustein's Window
  
positive.code: "Farr, David",The Heart of Robin Hood
  unknown,The Hostage
  unknown,The House of Blue Leaves
  unknown,The Iceman Cometh
  unknown,The Illusion
  unknown,The Imaginary Invalid
  "Wilde, Oscar",The Importance of Being Earnest
  unknown,The Island
  unknown,The Knight of the Burning Pestle
  
negative.code: unknown,Ballerina
  "Coward, Noël",Blithe Spirit
  unknown,Blood Wedding
  "Cleage, Pearl",Blues for an Alabama Sky
  unknown,Born Yesterday
  unknown,Boy Meets Girl
  unknown,Brand
  unknown,"Breakfast, Lunch & Dinner"
  unknown,Breaking the Silence
  unknown,Broadway
  "Inge, William",Bus Stop
  "Schenkkan, Robert",By the Waters of Babylon
  "Lawrence, Jeremy",Cabaret Verboten
  "Williams, Tennessee",Cat on a Hot Tin Roof
  unknown,Charley's Aunt
  unknown,Chicago
  