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