def METHOD_NAME(wc):
    r"""Function for $\Delta L=2$ decays like $\tau^-\to \mu^- e^+ \mu^-$."""
    return (2 * abs(wc['CVLL'])**2 + abs(wc['CVLR'])**2 + abs(wc['CVRL'])**2 + 2 * abs(wc['CVRR'])**2
            + 1 / 8 * (abs(wc['CSLL'])**2 + abs(wc['CSRR'])**2))