ok, ok, so it wasn't so difficult to find a way to do it : 
my $ref = $hash->{'card'} ; 

my @keys = sort { hex $ref->{$a}{'fa'} <=> hex $ref->{$b}{'fa'} }  key
+s % { $ref } ;

[download]
Thanks !

In reply to Re^2: Sorting hash keys by sub hash values by ZlR
in thread Sorting hash keys by sub hash values by ZlR

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