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