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    Thank, works now. Only problem left: method isoOptional was missing. To see this you have to click attempt.
    Added it to my solution and it was accepted. You may add it to the template.

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    In isoEUTest you use methods conv, lrl and rlr. There is no implementation for these methods. I even can't find a signature. I checked the code for other languages but found nothing useful.
    As expected my solution fails as test classes can't compile.