closed string

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 some fibor, although the game itself may still be open) via folding. (see also zero bubble, loop)
Actually, there is no loop requirement for a string to be closed (not open), since the end of the string must attach to a (mem)brane (even if that membrane is the string's other endpoint). Therefore, the yield is derived when in that a string is closed, but only by acoustic approximation.

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