# Feynman diagram of order 3 in Yukawa theory

Is it possible to have a Feynman diagram with 3 vertices for process involving 2 initial particles and 2 final particles? For example, for the scattering of a fermion and anti-fermion in the Yukawa theory $\psi \overline{\psi} \rightarrow \psi \overline{\psi}$ where the interaction term is $\phi \psi \overline{\psi}$

You could have for example the following $\psi \bar{\psi} \to \psi \bar{\psi}$ diagram, where there is one fermion propagator and one fermion propagator with a loop.