{HEAD ~ Friction} is generated during operation of the engine between {TAIL ~ the outer surface} of the friction damper and the undersides of two adjacent shrouds 
is generated between
{ HEAD ~ Friction } is generated during operation of the engine between { TAIL ~ the outer surface } of the friction damper and the undersides of two adjacent shrouds
HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH