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Are the spinors one can find in the Feynman rules always solutions of the free Dirac equation?

In these calculations one will encounter incoming and outgoing particles (and antiparticles) which are represented by spinors. These spinors are solutions of the Dirac equation. … If the things I said aren't wrong I would like to know whether these spinors are always (e.g. for Bhabha scattering) solutions of the free Dirac equation or not. …
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