{HEAD ~ each element} thereby providing {TAIL ~ a number} of adjacent pointwise boundary layer interruptions corresponding to the number of blade like members thereof, 
providing
{ HEAD ~ each element } thereby providing { TAIL ~ a number } of adjacent pointwise boundary layer interruptions corresponding to the number of blade like members thereof ,
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH