Moreover, the “second leg” corresponds to {TAIL ~ the standing leg} in {HEAD ~ the next single leg grounded period} 
Moreover , the “ second leg ” corresponds to { TAIL ~ the standing leg } in { HEAD ~ the next single leg grounded period }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD