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