How it is possible to create coins only with the proof of stake system?

How it is possible to create coins only with the proof of stake system?

Nick Szabo comes 2011 with a alternative proof system wich he calls proof of stake POS. This system was used later by varios coins ( NXT, Peercoin, Blackcoin etc.) but all of them had the genesis coins premined or have them created in the beginning with the proof of work system. But how it would be possible to create coins only with the proof of stake system from the beginning ?

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