{HEAD ~ The system} of {TAIL ~ equations} and is equivalent to the system of equations , and with respect to the factor L: 
of
{ HEAD ~ The system } of { TAIL ~ equations } and is equivalent to the system of equations , and with respect to the factor L :
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