In one example, {HEAD ~ the two cores} have {TAIL ~ adjacent ends} which are contiguous, and in other cases the adjacent core ends are separated by a space 
have
In one example , { HEAD ~ the two cores } have { TAIL ~ adjacent ends } which are contiguous , and in other cases the adjacent core ends are separated by a space
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH