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If I have a system with one component A and the TCB is {A} and I have another component B with a TCB of {B}, if I were to place the two components together would the new TCB of combined components be {A, B}?

In other words, is the TCB of {B} independent to its external surroundings and therefore can be aggregated?

If I were to move B to another system, the TCB of B itself wouldn't change and is not affected by its environment?

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