Of course, the edge running parallel here to the outlet plane of {HEAD ~ the tube} 20 can be brought back to the outlet plane step again by means of {TAIL ~ a curved path} 
Of course , the edge running parallel here to the outlet plane of { HEAD ~ the tube } 20 can be brought back to the outlet plane step again by means of { TAIL ~ a curved path }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL