{HEAD ~ The eraser} includes {TAIL ~ a housing} having a front wall to which is attached an eraser head 
{ HEAD ~ The eraser } includes { TAIL ~ a housing } having a front wall to which is attached an eraser head
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH