Tarek, thanks for a great Apprentice and an ever greater Master level puzzle!
I really enjoyed the N/H-Subsets required for solving these puzzles.
Finding the crucial N/H-Subsets combination breaking the Master level puzzle, did not come easy to me.
I first found it after I could not find any further advanced solving techniques ... leading nowhere. I found 2 Finned Fish, 1 X-Wing (and 1 Turbot Fish, if I remember correctly).
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Quis custodiet ipsos custodes?
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