A closed string (more accurately, closed coil) is a string state with no open circuitry (does not have endpoints; forms a loop). All game-related strategies (goals) are devised to obtain a closed string (thereby solving and validating it as a fibor) via folding.


Note (+): Actually, there is no loop requirement for a string to be closed (not open), since the end of the string must attach to a membrane (even if that membrane is the string's other endpoint). Therefore, the yield is derived when we say that a string is closed, but only by acoustic approximation.

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