In {TAIL ~ an alternative embodiment}, {HEAD ~ the core} has a compression of 60 or less 
In
In { TAIL ~ an alternative embodiment } , { HEAD ~ the core } has a compression of 60 or less
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH