Coherent configurations and generalized polygons -- Some thoughts oh the no-three-in-line problem -- A moore-penrose inverse for boolean relation matrices -- The stability index of graphs -- Stability -- An application of combinatorial techniques to a topological problem -- Embeddings of projective planes -- An Extension of kasteleyn's method of enumerating the 1-factors of planar graphs -- A class of block designs having the same parameters as the design of points and lines in a projective 3-space -- Counting stable trees -- The Hamiltonian product of graphs -- Derivable chains containing generalized hall planes -- Characterisation of a pregeometry by its flats -- Eulerian washing machines -- Sum-free sets, difference sets and cyclotomy -- Polyhedral decomposition of trivalent graphs -- Graphs and block designs associated with the three-dimensional unitary groups -- Williamson matrices of even order -- Supersquares.