❪✺_ₛₛ❫ Mechanical Subsets ○ Relationships

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• ❪✺₄❫ Mechanical Sets ○
• ❪✺_❫ Mechanical Subs ○
• ❪✺_ₛₛ❫ Physical Subsets ○

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• ❪✺_ₛₛ❫ Quantum Subsets ○

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