On Thu 19 Jun 2003 22:07, Guy Steele - Sun Microsystems Labs wrote: > Sometimes an circular structure can be used to "advantage". > Consider this bit of code: > > (mapcar #'+ x '#1=(1 -1)) > > If x is (1 4 7 10), the result will be (2 3 8 9). In what way is #1=(1 -1) circular? -- Grzegorz Chrupała jabber://grzegorzc@jabber.org website <http://pithekos.net>