anchor.diff:  wc,count-words
   heapsort,heapsort
   methcall,methods
  -objinst,objects
   random,random
   regexmatch,regex
   spellcheck,spellcheck
  
positive.code: process,
  message,
  takfp,
  nsieve
  nsievebits
  fannkuch
  pidigits
  
negative.code: spectralnorm
  health
  raytracer
  binarytrees
  implicitode,
  dispatch,
  
  