one

Correct!

Crossbow - This machine consists of a wheel, four crossbows, a shield and the stand for the shield. The wheel is turned by men walking on top of the wheel. An archer is inside the wheel, firing the crossbows as they come around. The arrows are fired through the stand, and the shield protects the men walking on the wheel.

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eight
water wheel
exerciser
crossbow
launcher
instructions


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