At least one light emitting diode is preferably included in {TAIL ~ the plurality} of {HEAD ~ diodes} 
At least one light emitting diode is preferably included in { TAIL ~ the plurality } of { HEAD ~ diodes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD