anchor.diff:  
   %% API
   -export([create/1,
  -    insert/2,
  -    delete_table/1,
  -    delete/2,
  -    backup_table/1,
  -    backup_tables/0,
  -    select/2,
  -    select/3,
  -    foldl/3,
  -    empty_table/1]).
  +         insert/2,
  +         delete_table/1,
  +         delete/2,
  +         backup_table/1,
  +         backup_tables/0,
  +         select/2,
  +         select/3,
  +         foldl/3,
  +         empty_table/1]).
   
   %% Public API
   %% @doc Create ets table wrapper. Use match cases for adding different options to the table.
  
positive.code:     case ets:info(handler_registry) of
          undefined ->
              case ets:new(handler_registry, [set, public, named_table]) of
              handler_registry ->
                  ok;
              Error ->
                  {error, Error}
              end;
          _InfoList ->
              ok
  
negative.code: create(zones) ->
      case ets:info(zones) of
          undefined ->
              case ets:new(zones, [set, public, named_table]) of
                  zones ->
                      ok;
                  Error ->
                      {error, Error}
              end;
          _InfoList ->
              ok
      end;
  