             initialState: State,
             reduce: @escaping (State, Event) -> State,
             scheduler: SchedulerType,
-            feedback: (Observable<State>) -> Observable<Event>...
+            feedback: [(Observable<State>) -> Observable<Event>]
         ) -> Observable<State> {
         return Observable<State>.deferred {
             let replaySubject = ReplaySubject<State>.create(bufferSize: 1)

                })
        }
    }
}

    public static func system<State, Event>(
            initialState: State,
            reduce: @escaping (State, Event) -> State,
            feedback: [(SharedSequence<SharingStrategy, State>) -> SharedSequence<SharingStrategy, Event>]
        ) -> SharedSequence<SharingStrategy, State> {
        return SharedSequence<SharingStrategy, State>.deferred {
            let replaySubject = ReplaySubject<State>.create(bufferSize: 1)
