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