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