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