The algal turf naturally has {TAIL ~ a surface} comprising the cell walls of {HEAD ~ the algae} 
The algal turf naturally has { TAIL ~ a surface } comprising the cell walls of { HEAD ~ the algae }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD