anchor.diff:                  unavailable ->
                       {error, {no_process, Name}};
                   _ ->
  -                    case get_members(Name) of
  -                        [] -> {error, {no_process, Name}};
  -                        Members ->
  -                            lists:nth(NextProcessIndex, Members)
  -                    end
  +                    get_member(Name, NextProcessIndex)
               end
       end.
   
  
positive.code:         [P, N] <- ets:match(pg2_table, {{member, Name, '$1'},'$2'}),
          _ <- lists:seq(1, N)].
  
  local_group_members(Name) ->
      [P || 
          [Pid] <- ets:match(pg2_table, {{local_member, Name, '$1'}}),
  
negative.code:     end.
  
  -type name() :: term().
  -type position() :: integer().
  
  -spec delete(name()) -> 'ok'.
  
  