The method includes the steps of providing the apparatus of the invention, energizing the suction device, and moving {HEAD ~ the eraser} across {TAIL ~ a chalkboard} to collect chalk dust 
across
The method includes the steps of providing the apparatus of the invention , energizing the suction device , and moving { HEAD ~ the eraser } across { TAIL ~ a chalkboard } to collect chalk dust
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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH