Thank you very much Laurent_R , now I need a bit time to study your code, especially to internalize the flag system with $continue. I like the idea to instantly make the chains with push @{$predec{$pred}}, $succ; Thank you for your time.

In reply to Re^4: Looking for the first item in the chain by vagabonding electron
in thread Looking for the first item in the chain by vagabonding electron

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