Basic nitrogen contents reach up to 2,000 ppm while {HEAD ~ the total nitrogen contents} reach {TAIL ~ 3,000 ppm} or more 
reach
Basic nitrogen contents reach up to 2,000 ppm while { HEAD ~ the total nitrogen contents } reach { TAIL ~ 3,000 ppm } or more
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH