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