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