doOneThing() { callbackResult ->
            doAnotherThing(callbackResult) { anotherCallbackResult ->
                doThirdThing(anotherCallbackResult) { totalResult ->
                    showResultToUser(totalResult)
                }

            }
        }



        val result = doOneThing().await()
        val secondResult = doAnotherThing(result).await()
        val totalResult = doThirdThing(secondResult).await()
        showResultToUser(totalResult)



        Single.fromCallable(doOneThing())
            .flatMap(::doAnotherThing)
            .flatMap(::doThirdThing)
            .subscribe(::showResultToUser)