Solution
= Solution
Gauge invariance, $SU(p)$ flavor symmetry and R-charge two permit
$$
\boxed{W=M^{ij}q_iq_j+Utt},
$$
with the Spin(8) vector and spinor indices contracted by their invariant bilinear forms. Indeed, $R[Mqq]=0+1+1=2$ and $R[Utt]=12-5-5=2$. Powers of the matching scale can be inserted to give fields whichever canonical mass dimensions are chosen.