Hello, I'm trying to realize something like that: I have different lists that I have to sort in ascending order according to their first element, but I cannot find a solution.
In other words I'd like to have the lists (1 a b c) (5 d e f) (3 g h i)
ordered in this way: (1 a b c) (3 g h i) (5 d e f)
thanks a lot,
Libero