The mulching mower 10, 11 or 12, wherein {TAIL ~ lengths} of {HEAD ~ said upper and lower cutter blades} are equal 
The mulching mower 10 , 11 or 12 , wherein { TAIL ~ lengths } of { HEAD ~ said upper and lower cutter blades } are equal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH