diff3.mws 1. Permutations with forbidden "position gaps" and the principle of Inclusion-Exclusion Plotting routines archive 2. Templates and permutations with Omega-exceptions (programme) 3. Special cases of permutations with forbidden "position gaps" Derangements (or Rencontres) Menage numbers A simplified menage problem 2-Menage numbers Variants of 2-menage numbers 3-Menage numbers Variants of the 3-Menage problem 4-Menage numbers 5-Menage numbers 4. Cyclically constrained position gaps Forced position gaps Forbidden position gaps Conclusions