anchor.diff:  open Yard.Core.IL
   open Microsoft.FSharp.Text.StructuredFormat
   open Microsoft.FSharp.Text.StructuredFormat.LayoutOps
  +open System.IO
   
   type CYKGeneartorImpl () =
       let header =
  
positive.code:         override this.Name = "CYKGenerator"
          override this.Generate t = 
              let g = new CYKGeneartorImpl()
              g.Generate t |> box
          override this.AcceptableProductionTypes = ["seq"]
negative.code:     let layoutToStr = 
          StructuredFormat.Display.layout_to_string 
            {StructuredFormat.FormatOptions.Default with PrintWidth=80}
  
      let code rules termDict =
          [ header
  