The length L2 of flexible region 228 should be sufficient that flexible region 228 spans {HEAD ~ the entire length} of {TAIL ~ bend region} 218 
The length L2 of flexible region 228 should be sufficient that flexible region 228 spans { HEAD ~ the entire length } of { TAIL ~ bend region } 218
OTH OTH OTH OTH 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 OTH