+0. Add tests for orthogonality in the Peirce decomposition.
+
1. Add CartesianProductEJA.
2. Check the axioms in the constructor when check != False?
5. Factor out the unit-norm basis (and operator symmetry) tests once
all of the algebras pass.
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-6. Implement random_instance() for the main EJA class.
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-7. Implement random_instance() for the subalgebra class.