Thank you very much folks, you have enlightened the points I could not figure out.

Both solutions (HoAoH by robotics and japhy; HoHoH by liverpole) worked.
HoHoH solution has the drawback that the interpreter generates an initialization error during initialization of indices.

Thanks again for your ultra-fast answers!

In reply to Re^2: Creating members of hash of hashes parallelly by utku
in thread Creating members of hash of hashes parallelly by utku

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