The printing device prints an image by forming {HEAD ~ dots} on the medium by {TAIL ~ the printing head} 
The printing device prints an image by forming { HEAD ~ dots } on the medium by { TAIL ~ the printing head }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL