anchor.diff:  
   module Features = 
   
  +    open System
  +    open System.Text.RegularExpressions
       open HomeDepot.Model
  +    open FParsec
   
       type Feature = Observation -> float
   
  
positive.code:                         if title.Contains word then acc + weight else acc) 0.
                  score
  
  
negative.code:     let stopwords = set [ "and"; "or"; "the"; "a"; "an"; "of" ]
      let removeStopwords (text:string Set) = Set.difference text stopwords
  
      let matchWords = Regex(@"\w+",RegexOptions.Compiled)
  
      let wordTokenizer (text:string) =
  