05Bxx Designs and configurations,

• 05B05 Block designs, See also {51E05, 62K10}
• 05B07 Triple systems
• 05B10 Difference sets (number-theoretic, group-theoretic, etc.), See also {11B13}
• 05B15 Orthogonal arrays, Latin squares, Room squares
• 05B20 Matrices (incidence, Hadamard, etc.)
• 05B25 Finite geometries, See also {51D20, 51Exx}
• 05B30 Other designs, configurations, See also {51E30}
• 05B35 Matroids, geometric lattices, See also {52B40, 90C27}
• 05B40 Packing and covering, See also {11H31, 52C15, 52C17}
• 05B45 Tessellation and tiling problems, See also {52C20, 52C22}
• 05B50 Polyominoes
• 05B99 None of the above but in this section