{HEAD ~ The regions} made of {TAIL ~ magnetic material} are impressed with a magnetic material which can be erased by chemical and mechanical action 
made of
{ HEAD ~ The regions } made of { TAIL ~ magnetic material } are impressed with a magnetic material which can be erased by chemical and mechanical action
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH