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Wed Feb 10 09:30:03 CET 2010

Terms do not know of environments

Trying to express the problem of merging environments as a monad lead
me to think that mabye this needs a different terminology.

Terms are self-contained tree structures, and the environment is only
there to track sharing/memoization, i.e. to identify unique nodes.
Let's just call it "Nodes" then.

Next: refactor the code accordingly: the Nodes collection is
parameterized by Term, and only needs some abstract operations on it.





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