When the ball comes at the end of the potato filling on the front of the casing of a pen and put another potato rolls come in a hole at the rear end of the casing of a pen. Bring the long wooden peach size Push the back of the casing of a pen with potato filling with speed will cause air pressure occurs inside the casing. As a result, potatoes moving forward with great speed to overcome the friction surface potatoes made to the surface of the casing of a pen. Make the potato to spout out in front with speed.
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