For the rolling granulation, {HEAD ~ a granulator} such as {TAIL ~ a pan granulator} and a drum granulator may be used 
such as
For the rolling granulation , { HEAD ~ a granulator } such as { TAIL ~ a pan granulator } and a drum granulator may be used
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH