In one embodiment, the spacer includes {HEAD ~ at least one cushioning segment} defining a gap for providing {TAIL ~ the separation} 
In one embodiment , the spacer includes { HEAD ~ at least one cushioning segment } defining a gap for providing { TAIL ~ the separation }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL