{HEAD ~ A pair} of {TAIL ~ cutter blades} are arranged to the right and to the left of the mulching mower in a cutter housing which opens downwardly 
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{ HEAD ~ A pair } of { TAIL ~ cutter blades } are arranged to the right and to the left of the mulching mower in a cutter housing which opens downwardly
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH