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