Disk 1 has a segment cut off and can turn about fixed axis A. Disk 2 has six symmetrically arranged arc-shaped recesses and can rotate about fixed axis B. Disk 2 is locked against rotation when the circular part of disk 1 enters one of the recesses, which are of the corresponding shape, in disk 2. Disk 2 can rotate when disk 1 is turned so that its flat part faces disk 2.
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