A single pass printer prints in a first direction and {HEAD ~ a second direction} on {TAIL ~ a print medium} 
A single pass printer prints in a first direction and { HEAD ~ a second direction } on { TAIL ~ a print medium }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL