In preferred form, the apparatus includes a body having a groove with markings to define the display area and {HEAD ~ a display bar} that slidably fits within {TAIL ~ the groove} 
slidably fits within
In preferred form , the apparatus includes a body having a groove with markings to define the display area and { HEAD ~ a display bar } that slidably fits within { TAIL ~ the groove }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL