[PD] change list order according to their first element

[Libero Mureddu]

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

-- 
Libero Mureddu
http://www.myspace.com/liberomureddu
http://www.resonatorhelsinki.com/