{HEAD ~ a collector} connected to {TAIL ~ said passage} for accumulating said grass cuttings; and 
connected to
{ HEAD ~ a collector } connected to { TAIL ~ said passage } for accumulating said grass cuttings ; and
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH