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Thank you very much for your help. I didn't understand from the text of the problem what was pretended. But looking for your query I understand it. I took the liberty to simplify your query a lot. I see that normaly people abuse of using aliases where they are not necessary. Here is my simplification:
Challenges
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Thank you very much for your help. I didn't understand from the text of the problem what was pretended. But looking for your query I understand it. I took the liberty to simplify your query a lot. I see that normaly people abuse of using aliases where they are not necessary. Here is my simplification: