said members have {HEAD ~ a quiescent position} wherein opposite sides of said members are substantially equally spaced, and said flexible middle conduit extends in substantially a straight line when said members are in {TAIL ~ their quiescent position} 
said members have { HEAD ~ a quiescent position } wherein opposite sides of said members are substantially equally spaced , and said flexible middle conduit extends in substantially a straight line when said members are in { TAIL ~ their quiescent position }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL