Show that a system of intersecting $D4$-$D6$ branes is supersymmetric

The paper "Supersymmetric Gauge Theories, Intersecting Branes and Free Fermions" asserts (first paragraph, page 12,section 2.4) that a system of $N$ $D4$-branes intersecting with $k$ $D6$ branes along two flat directions (say on a 2-torus) is supersymmetric. The paper suggests that this can be shown by mapping the system by a series of $T$-dualities into a $D0$–$D8$ or $D1$–$D9$ system.

Question: How can I explicitly obtain the duality transformation?