  We explore further the notion of cluster adjacency, focussing on non-MHV
amplitudes. We extend the notion of adjacency to the BCFW decomposition of
tree-level amplitudes. Adjacency controls the appearance of poles, both
physical and spurious, in individual BCFW terms. We then discuss how this
notion of adjacency is connected to the adjacency already observed at the level
of symbols of scattering amplitudes which controls the appearance of branch cut
singularities. Poles and symbols become intertwined by cluster adjacency and we
discuss the relation of this property to the $\bar{Q}$-equation which imposes
constraints on the derivatives of the transcendental functions appearing in
loop amplitudes.
