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