Like magnetic poles face each other so that {HEAD ~ the magnets} of {TAIL ~ the pair repel} each other 
Like magnetic poles face each other so that { HEAD ~ the magnets } of { TAIL ~ the pair repel } each other
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH