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"North Korea is a very closed system and closed economy so they created a successful industry for hacking and laundering and they don't care about the negative impression of cyber crime," Dr Dorit Dor from cyber security company Check Point said.

Or the TCM could be in an isolated chamber, evacuated of air, which is known as a closed system.

However, it is difficult to say how this particular model reasons because it is a closed system.

Because we have not fully aired the utter weirdness of having such a completely closed system such that nobody who litigates a Jan. 6 case at the Supreme Court can stand at the lectern and say, “Oh, by the way, that guy, he should not be here.”

Unlike cell phone or car batteries, those designed for grid energy storage do not have to function as a portable, closed system.