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