A new induction phase begins to induce a north pole on {HEAD ~ tooth} 4, and to reinforce {TAIL ~ the magnetic strength} of teeth 2 and 3 
A new induction phase begins to induce a north pole on { HEAD ~ tooth } 4 , and to reinforce { TAIL ~ the magnetic strength } of teeth 2 and 3
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH