{HEAD ~ The steps} and processes that are common to {TAIL ~ many embodiments} of the invention are described below 
are common to
{ HEAD ~ The steps } and processes that are common to { TAIL ~ many embodiments } of the invention are described below
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH