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