| 摘要 |
The game is played on a transparent square board (5) that is marked with squares. Two turning discs (8,10) are mounted under the board and are marked with complementary motifs. They are turned by an axle (1) that passes through a central hole in the board. A pinion (9), in the upper disc, engages in a crown (15) with inner teeth, in the lower disc. The pinion is joined to the axle and the crown turns round an axis (17) that is off centre with respect to the axis of the pinion (16).
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