each matrix. Then those in the next row are determined and repeated until the ultimate row is found. This is similar to the method used in [@36] to deduce (\[anom2\]) and (\[anom3\]). The basic reason for this literal bottom up approach is that the counterterms to be determined are intertwined due to the triangularity of the matrix and this is the systematic way to disentangle them. However, in defining the RI${}^\prime$/SMOM scheme here in the general terms indicated in (\[rissmomdef\]) one has to be careful in any situation involving the vector current due to the underlying Slavnov-Taylor identity which affects this operator. We will discuss this caveat in more detail later as it arises not just in the case of the vector current itself but is embedded in each set $W_2$ and $W_3$.

Having concentrated on the general quantum field theoretic formalism that is used, we now comment on the practicalities of the calculation. We use standard tools for this. All the algebra is carried out with the symbolic manipulation language [Form]{}, [@43]. The three one loop Feynman diagrams are generated in electronic form by the [Qgraf]{} package, [@44], with the output converted into [Form]{} input notation. This procedure appends 