The friction damper includes {HEAD ~ a plate} underlying {TAIL ~ radially outer shrouds} of two adjacent airfoils  
underlying
The friction damper includes { HEAD ~ a plate } underlying { TAIL ~ radially outer shrouds } of two adjacent airfoils
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH