Furthermore, typically, the “first leg” corresponds to {HEAD ~ a standing leg} in {TAIL ~ the current single leg grounded period} and the “second leg” corresponds to the idling leg in the current single leg grounded period 
in
Furthermore , typically , the “ first leg ” corresponds to { HEAD ~ a standing leg } in { TAIL ~ the current single leg grounded period } and the “ second leg ” corresponds to the idling leg in the current single leg grounded period
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH