“…The diamond grid is not a point-lattice (Conway and Sloane, 1988), because there are p, q [ D, such that p 1 q = 2 D. The grid has two types of points (such as the 2D triangular grid that is also not a point-lattice, but the theory of neighborhood sequences is developed for this grid as well (Nagy, 2002(Nagy, , 2004(Nagy, , 2007). …”