def METHOD_NAME(self, other):
    r"""
    Multiply ``self`` and ``other``.
    EXAMPLES::
        sage: J3 = groups.misc.Cactus(3)
        sage: s12,s13,s23 = J3.group_generators()
        sage: PJ3 = groups.misc.PureCactus(3)
        sage: elt = PJ3(s23*s12*s23*s13)
        sage: elt * elt
        s[2,3]*s[1,2]*s[2,3]*s[1,2]*s[2,3]*s[1,2]
    """
    return type(self)(self.parent(), self.value * other.value)