{HEAD ~ The number} of guide bars in each circular concentric series increases from the radially inner series to {TAIL ~ the radially outer series} of guide bars 
increases to
{ HEAD ~ The number } of guide bars in each circular concentric series increases from the radially inner series to { TAIL ~ the radially outer series } of guide bars
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH