{HEAD ~ The switching fabric} comprises {TAIL ~ a plurality} of data ports through which data frames enter or exit the switching fabric 
comprises
{ HEAD ~ The switching fabric } comprises { TAIL ~ a plurality } of data ports through which data frames enter or exit the switching fabric
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH