As a result, {TAIL ~ a large amount} of {HEAD ~ OH radicals} and ozone is efficiently generated, further promoting the combustion 
As a result , { TAIL ~ a large amount } of { HEAD ~ OH radicals } and ozone is efficiently generated , further promoting the combustion
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH