groups form a set of parallel subspaces. See also Constant weight code Kirkman's schoolgirl problem Sylvester–Gallai configuration Notes References References . . 2nd ed. (1999) . . . External links Steiner systems by Andries E. Brouwer Implementation of S(5,8,24) by Dr. Alberto Delgado, Gabe Hart, and Michael Kolkebeck S(5, 8, 24) Software and Listing by Johan E. Mebius Combinatorial design Design of experiments Families of sets de:Steiner-Tripel-System