| http://www.w3.org/ns/prov#value | - across an underlying surface in such a manner as to be propelled in response to leaning of the device and such that leaning of the device is not cancelled while the device is in motion; and c. using a differential controller to cause each of the two primary ground-contacting members to be differentially driven so as to cause a specified turning motion of the vehicle about a vertical axis fixed wit
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