Figure 9 . The left part of the (cid:12)gure depicts the brane con(cid:12)guration realizing k -instantons in SQCD, in the presence of intersecting surface defects, of M2-type and labeled by symmetric represen- tations, represented by the gray branes. 28 The right part of the (cid:12)gure shows the quiver description of the worldvolume theory of the D0-branes. As the system preserves two-dimensional supersymmetry dimensionally reduced to zero dimensions, the quiver is drawn using notations, with full lines representing chiral multiplets and dashed lines Fermi multiplets. In the absence of the defects, the preserved supersymmetry is turn a J-type superpotential J (cid:3) for the adjoint Fermi multiplet (cid:3) consisting of the sum of the adjoint bilinears of the scalars of the two pairs of chiral multiplets. The charges in table 1 are also compat- ible with quadratic E- or J-type superpotentials for the Fermi multiplets charged under U( n L/R