interface OneRepository {
 fun operation(): Either<Error, Boolean>
}
interface OtherRepository {
 fun otherOperation() : Either<Error, Int>
}
class UseCase(val repository: OneRepository, val otherRepository: OtherRepository) {
 fun run(): Either<Error, String>() {
 val result = repository.operation()
 // TODO("If the result is success, then call the second repository, and if that result is also success return a success result")
 // TODO ("How we can handle the error for both repositories?")
 }
}