While {HEAD ~ the writing instrument} according to preferred embodiments is {TAIL ~ a pen}, it is understood that the writing instrument may alternatively be a marker, pencil, chalk, crayon or any of various other known writing instruments 
While { HEAD ~ the writing instrument } according to preferred embodiments is { TAIL ~ a pen } , it is understood that the writing instrument may alternatively be a marker , pencil , chalk , crayon or any of various other known writing instruments
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH