In other embodiments, {TAIL ~ the coil restraints} are attached in each trough along the length of {HEAD ~ the trough} 
In other embodiments , { TAIL ~ the coil restraints } are attached in each trough along the length of { HEAD ~ the trough }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD