In {HEAD ~ an embodiment}, {TAIL ~ the region} 38 has depth greater than the region 34 
In { HEAD ~ an embodiment } , { TAIL ~ the region } 38 has depth greater than the region 34
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH