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