{HEAD ~ The output side} 16 includes a plurality of switching modules 22, including {TAIL ~ first, second and third modules} 24, 27 and 29, respectively 
{ HEAD ~ The output side } 16 includes a plurality of switching modules 22 , including { TAIL ~ first , second and third modules } 24 , 27 and 29 , respectively
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH