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During your hard job to find a valid grid for teh Hybrid : jigsaw + 2 even 2 odd,
you can take some rest and relax with the following

To solve this is necessary to apply the Law of Leftovers

I need your comments about the difficulty of above grid to understand if I can put, in the contests, Jigsaw where is necessary the LoL for the solution

ho bisogno dei vostri commenti sulla difficoltà delle griglia sopra per capire se le posso mettere nei contest.