Sorting with only a partial order definition

[Fredrik Lundh]

Bryan Olson wrote:

> The usual tools to deal with partial orderings are directed acyclic graphs,
> and "topological sorting".  Try Googling the terms along with "Python".

here's a rather powerful timbot implementation:

    http://mail.python.org/pipermail/python-list/1999-July/006625.html

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