anchor.diff:  
   let
     unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
  +  mod = "Mod4";
   in
     {
       nixpkgs.config = {
  
positive.code:       enable = true;
        windowManager.i3 = {
          enable = true;
          config.modifier = "Mod4";
        };
      };
      imports = [
  
negative.code:     programs = {
        home-manager.enable = true;
  
        rofi.enable = true;
        fzf.enable = true;
        firefox.enable = true;
        chromium.enable = true;
  