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							- from .core import exhaust, multiplex
 
- from .traverse import top_down
 
- def canon(*rules):
 
-     """ Strategy for canonicalization
 
-     Apply each branching rule in a top-down fashion through the tree.
 
-     Multiplex through all branching rule traversals
 
-     Keep doing this until there is no change.
 
-     """
 
-     return exhaust(multiplex(*map(top_down, rules)))
 
 
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