It should be appreciated, however, that simple variants such as {HEAD ~ discretization} by {TAIL ~ truncation} can de used without changing the overall solution process and architecture 
by
It should be appreciated , however , that simple variants such as { HEAD ~ discretization } by { TAIL ~ truncation } can de used without changing the overall solution process and architecture
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH