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Tree Calculus
One operator. Trivial semantics. Turing complete. Intensional.
This makes for all-powerful REPLs; translated to Python, imagine using nothing but a Jupyter Notebook for an entire product lifecycle, from prototyping to productionization. Such interpreters are effectively safe by construction, since the reduction rules are simple (resulting in little code) and pure (no inherent access to the environment or resources). The ability to bootstrap the full power of Tree Calculus anywhere makes it an excellent configuration as code language in a heterogeneous system.
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