for each $arzt_nr i need to pick 15 random $versnummers.
there might be not enough $versnummers sometimes then i just take all of them, and each $versnummer{ziffer} may be one of the 15, but when there are more then 15 i need to pick different $versnummers before picking the same ones with different "ziffers"
would be great if anyone had an idea on how to solve this, somehow i'm at a loss with this problem...