anchor.diff:    pass;
   do_validate(_Key, ?STORE_BEGIN_TAG ++ Rest, A)         ->
     Key = string:sub_string(Rest, 1, string:str(Rest, ?STORE_END_TAG) - 1),
  -  put_var(Key, A),
  +  ets:insert(?MODULE, {Key, A}),
     pass;
   do_validate(Key, E, A)                                 ->
     compare(Key, E, A).
   
  -put_var(Key, Value) -> put(?VAR_PREFIX ++ Key, Value).
  +%% put_var(Key, Value) -> put(?VAR_PREFIX ++ Key, Value).
   %% get_var(Key) -> get(?VAR_PREFIX ++ Key).
   
   compare(_Key, E, E) -> pass;
  
positive.code: 
  %%%_* Internal =========================================================
  run_scenario(Scenario, Blueprint, Params, Vars) ->
    [put_var(Key, Value) || {Key, Value} <- Vars],
    run_operations( Scenario
                , Blueprint#katt_blueprint.operations
                , Params
                , []
                ).
  
  run_operations( Scenario
                , [#katt_operation{ description=Description
  
negative.code:          ]).
  
  substitute(Bin) ->
    FirstKey = ets:first(?MODULE),
    substitute(Bin, FirstKey).
  
  substitute(Bin, '$end_of_table') -> Bin;
  substitute(Bin0, K0) ->
    V = ets:lookup(?MODULE, K0),
    K = ?RECALL_BEGIN_TAG ++ K0 ++ ?RECALL_END_TAG,
    Bin = re:replace(Bin0, K, to_list(V), [{return, binary}, global]),
    substitute(Bin, ets:next(?MODULE, K0)).
  
  %%%_* Validation -------------------------------------------------------
  validate(E = #katt_response{}, A = #katt_response{}) ->
  