{HEAD ~ The simulator} incorporates {TAIL ~ a liquid or solid spring} for simulating the force pulse on a projectile during firing of the projectile 
incorporates
{ HEAD ~ The simulator } incorporates { TAIL ~ a liquid or solid spring } for simulating the force pulse on a projectile during firing of the projectile
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH