And this fixes yet another problem: 'mark-first-parents' seems solid now.
'unmark' still needs work but I see no reason I can't fix it as well. I'll
it here if I succeed.
"""mark the first parent of each node, moving up the tree
to the top level. print the list of marked parents."""
parent_lst = 
p = c.p
old_p = p
if not p.isMarked():
for parent in p.parents():
if not parent.isMarked():
g.es("marked: " + str(parent_lst))
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