What is a constraint? In Energy-Efficiency Theory, a constraint is not an auxiliary concept but a fundamental ontological category---the second link in the generative chain after energy itself. Version 3. 3 derives the complete operational grammar of constraint from the conclusion of the energy bifurcation theorem, aligned with the Core Rules v6. 1 constitutional architecture. From the three physical constitutional presuppositions and the necessary bifurcation of energy into free-state and constrained-state forms, we prove that any universe sustaining persistent structure must exhibit exactly five irreducible constraint operations: Formation, Meltdown, Maintenance, Transient Event, and Capture. These five are not a descriptive catalogue but the complete logically necessary set of operations on constraints---exhausting all possible transitions among the four fundamental states (E, M) defined by the presence or absence of a constraint and its maintenance power. The proof proceeds by exhaustive enumeration of the state space generated by two independent binary variables, yielding a completeness guarantee stronger than any analogical argument. The Bifurcation Duality Theorem (Two Forms of Energy v3. 4) establishes that the two variables correspond to the two constitutionally irreducible sub-processes of the energy bifurcation: the free-state half-cycle and the constrained-state half-cycle. At optimal balance =1, the two sub-processes are structurally symmetric, and the minimum action quantum A₄₄ₓ=/2 follows as the equipartitioned action of a single constraint transition event. The five operations are unified under a single principle: constraint as the manager of the two fundamental asymmetries. The Default/Exception Asymmetry (Eb^melt Eb^form, L2 derived theorem) makes destruction quantitatively easier than construction; the Creative Asymmetry ( () =4/ (+1) ², (1) =1, appearing only in the formation rate, L3 Derived Structural Principle) makes construction structurally more demanding. The five operations constitute the complete management strategy: Formation and Meltdown execute directional changes; Maintenance continuously compensates spontaneous degradation; Transient Events test new configurations at minimal cost; and Capture records successful tests into persistent structure. We establish the constraint network as the universal syntax of EET. Type I constraints (maintained boundaries) are the physical carriers of Being-as-Resistance. Type II constraints (free-state channels) are the absence of maintained boundaries. The lifecycle of a constraint---Emergence, Stabilization, Persistence, Dissolution---is the lifecycle of being itself. Two extremal limits bound all possible constraint network configurations: the zero-constraint limit (the pre-bifurcation substrate of pure free-state energy, N=0 vacuum) and the complete-constraint limit (jammed rigidity, J). Our universe occupies the intermediate regime between these limits. Version 3. 3 is a comprehensive structural completion. It adopts the v6. 1 authoritative cooperative capacity () =4/ (+1) ², (1) =1 (CLOSED-in-EET), with the constraint circle Cₘ²+Cᵣ²=1 retained as geometric motivation. It unifies the S₁--S₃ state numbering with Constraint Dynamics v3. 2, QM v3. 0, Difference v3. 2, and Ben-Se v3. 3. It incorporates the Bifurcation Duality Theorem, constitutionally deriving A₄₄ₓ=/2 and establishing the capacity duality =2 Cₘ Cᵣ. It adds ten new Part II interfaces (Gravitation, Vacuum, Contradiction, Causality, Information, QM, Statistical Mechanics, Measurement, Temperature, Graph-Theoretic Ontology), completing coverage to twenty-eight companion ontologies. It positions the five constraint operations as the operational center of EET's resolution of twenty-seven unsolved problems across quantum foundations, spacetime and gravity, statistical mechanics, particle physics, and complex systems science---a master table maps each challenge to the constraint operations that resolve it. Constraint is the executor face of Distinction---the hand that draws the line from which all structure unfolds. In the five constraint operations, the energy bifurcation acquires its operational grammar. In that grammar, twenty-seven of the deepest unsolved problems in physics find their common constitutional root.
Hongpu Yang (Sat,) studied this question.