{HEAD ~ Method} for drawing a flow of air and {TAIL ~ particulates} into a vacuum cleaner 
{ HEAD ~ Method } for drawing a flow of air and { TAIL ~ particulates } into a vacuum cleaner
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH