anchor.diff:  
   join_remote_update_ets(Scope, ScopeMon, MG, Group, Pid) when is_pid(Pid) ->
       case ets:lookup(Scope, Group) of
  -        [{Group, All, Local}] ->
  +        [{_Group, All, Local}] ->
               ets:insert(Scope, {Group, [Pid | All], Local});
           [] ->
               ets:insert(Scope, {Group, [Pid], []})
  
positive.code: 
  join_local_update_ets(Scope, ScopeMon, MG, Group, Pid) when is_pid(Pid) ->
      case ets:lookup(Scope, Group) of
          [{Group, All, Local}] ->
              ets:insert(Scope, {Group, [Pid | All], [Pid | Local]});
          [] ->
              ets:insert(Scope, {Group, [Pid], [Pid]})
  
negative.code: leave_remote_update_ets(Scope, ScopeMon, MG, Pids, Groups) ->
      _ = [
          case ets:lookup(Scope, Group) of
              [{_Group, All, Local}] ->
                  case All -- Pids of
                      [] when Local =:= [] ->
                          ets:delete(Scope, Group);
  