anchor.diff:  ,binarytrees,ocaml,4
   ,binarytrees,clean,0
   ,binarytrees,gpp,0
  +,binarytrees,icpp,0
   
   ,binarytrees,lisaac,0
   
  
positive.code: ,message,pnet,0
  ,message,gpp,0
  ,message,gpp,3
  ,message,clean,0
  
  ,message,iron,0
  
negative.code: ,nsieve,scala,4
  ,nsieve,gpp,2
  ,nsieve,gpp,0
  ,nsieve,icpp,2
  ,nsieve,icpp,0
  ,nsieve,java,2
  X,nsieve,javaxx,2
  X,nsieve,javaxint,2
  