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We extend our previous analytic existence of a symmetric periodicsimultaneous binary collision orbit in a regularized fully symmetric equal massfour-body problem to the analytic existence of a symmetric periodicsimultaneous binary collision orbit in a regularized planar pairwise symmetricequal mass four-body problem. We then use a continuation method to numericallyfind symmetric periodic simultaneous binary collision orbits in a regularizedplanar pairwise symmetric 1, m, 1, m four-body problem for $m$ between 0 and 1.Numerical estimates of the the characteristic multipliers show that theseperiodic orbits are linearly stability when $0.54\leq m\leq 1$, and arelinearly unstable when $0<m\leq0.53$.

Existence and Stability of Symmetric Periodic Simultaneous Binary Collision Orbits in the Planar Pairwise Symmetric Four-Body Problem