{HEAD ~ This variation} in {TAIL ~ size} will usually produce the necessary density and incompressibility when in use as to minimize the leakage from the cell 
in
{ HEAD ~ This variation } in { TAIL ~ size } will usually produce the necessary density and incompressibility when in use as to minimize the leakage from the cell
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH