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This is quite a complex model to make but not difficult if you follow the instructions carefully. Unlike other models, the engine parts are not individually modelled in card. The tetraflexagon is a mathmatical model which allows the four strokes to be cycled endlessly.
这是一个相当复杂的模型，但如果你仔细按照说明并不困难。 不同于其他型号，发动机部件不单独建模卡。 Tetraflexagon是一个数学模型，它允许四个笔画无休止地循环。
Design: Ben Hughes.
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