... 3]},L1(7, 11, 12) = {[7, 8, 11], [7, 1, 12], [11, 7, 12]},L1 (8, 12, 2) = { [8, 9, 12], [8, 0, 2], [12, 8, 2]},L1 (12, 3, 6) = { [12, 0, 3], [12, 4, 6], [3, 12, 6]},L1(10, 1, 2) = {[10, ... analogousproblem for 3-cycle systems (or Steiner triple systems) is also very hard. This problemhas been considered and partially solved by Colbourn, Dinitz and Rosa [1] and Dinitz and Stinson [3].2 ... Milazzo and Zs. Tuza, Upper chromatic number of Steiner triple and quadruple systems, Discrete Math., 174 (1997), 247-259.[7] L. Milazzo and Zs. Tuza, Strict clourings for classes of Steiner...