In one aspect of the invention, {HEAD ~ a gas turbine engine} is defined by {TAIL ~ a plurality} of components including a housing, defining a central axis, a compressor section and a turbine section 
is defined by
In one aspect of the invention , { HEAD ~ a gas turbine engine } is defined by { TAIL ~ a plurality } of components including a housing , defining a central axis , a compressor section and a turbine section
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH