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