anchor.diff:  //    /// type of operating system
   //    member val OperatingSystem = os with get, set
       
  -    /// ID of computer in local network                                    ????????????????????????????????????????
  +    /// ID of computer in local network
       member val ID = id with get
       
       /// checks the health of computer
  
positive.code:         Seq.iter (fun x -> fontColor x
                             System.Console.WriteLine("computer number " + x.ID.ToString () + " is " + (health x))) computers
      
      /// simulates the unit of time and performs changes in the system
      member this.Step () =
          let tryInfect = Seq.concat <| 
  
      /// checks the health of the system
      member this.IsUnhealthy () =
  
negative.code:                   ignore <| stream.ReadLine()
                    while not stream.EndOfStream do
                      let line = stream.ReadLine()
                      let neighbors = Seq.map (fun x -> int x)                //Seq.fold (fun acc x -> (int x) :: acc) []
                                      << String.filter (fun x -> x <> '0')             ////???????????????????
                                      <| String.mapi (fun i x -> if (x = '1') then char i else x) line
                      yield neighbors }
      
      /// shows the adjacency matrix in the console
      member this.ShowAdjList () =
          Seq.iter (fun ls -> Seq.iter (fun c -> printf "%A" c) ls
                              printfn "") adjacencyList
  
  
      /// shows the health of each computer
      member this.ShowSystem () =
  