Since this implementation of new-seal is very inefficient, this package is also very inefficient. The clan code itself is inefficient for many use cases—it is to illustrate abstraction. With an efficient primitive new-seal a small modification to this set manipulation code would be efficient and also able to enforce abstraction and thus guarantee its inner logic.
Each invocation of slg returns a new clan of values. Two clans are incompatible. A clan is provided as a list of values:
This code guards against corruption of its internal data structures.