{HEAD ~ Post hole auger assembly} 18 includes {TAIL ~ a curved boom} 16 and an auger assembly 18 
includes
{ HEAD ~ Post hole auger assembly } 18 includes { TAIL ~ a curved boom } 16 and an auger assembly 18
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH