Assertion: viper's tail | /r/CapableOf | give the balance
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Source sentences:
text: For mobility, the VIPeR uses a pair of combined wheel/track systems (called the "Galileo Wheel" system, a patented technology by Galileo Mobility Instrument of Israel) that change shape to adapt to terrain, and a "tail" which give it the balance to go up stairs, and turn itself over.