anchor.diff:      | true -> Pass
       | false -> Fail
       
  -  | _ -> Unknown
  +  | _ -> Indeterminate
   
   let printResultGrid (grid) (rowTests : int list list) (columnTests : int list list) =
     let maxY = (Array2D.length1 grid) - 1
  
positive.code:     match result with
      | Pass -> printf "Y"
      | Fail -> printf "N"
      | Unknown -> printf "?"
    printfn ""
    printfn ""
    
  
negative.code:     match result with
      | Pass -> printf "Y  "
      | Fail -> printf "N  "
      | Indeterminate -> printf "?  "
      printRow row
      printfn ""
    printfn ""
  