On Sat, May 3, 2008 at 3:01 AM, derwisch <
[EMAIL PROTECTED]> wrote:

>
> Sorry, I haven't looked at the code so I am just theoretically
> speaking about it. If this is the case, then v.parents isn't in
> essence a set, because in the case of identical twins the same parent
> may occur twice, am I right?


Each vnode appears at most once in v.parents, so yes, v.parents is a set.
Furthermore, order does not matter.  Order matters in v.t.children.

Edward

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