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For every set T, the set Tree(T) is defined by
with constructors empty and node.
empty in Tree(T), forall e in T, l in Tree(T), r in List(T): node(e, l, r) in Tree(T).
Every element of Tree(T) is of the form
node(n0, node(n11, ...), node(n21, ...)),
node(1, node(2, node(3, empty, empty), node(4, empty, empty)), node(5, empty, empty))1
2 5
3 4