Then, {HEAD ~ a predetermined step} of copying is carried out in {TAIL ~ the electrostatic copying machine} 4 
is carried out in
Then , { HEAD ~ a predetermined step } of copying is carried out in { TAIL ~ the electrostatic copying machine } 4
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH