Some things have been done :)

diff --git a/PLAN b/PLAN
index ff4dd14e1c27c9e738e527a097c96f3633ffc9ca..b57a77edd16239179169b1f38345f40a8e287634 100644 (file)
--- a/PLAN
+++ b/PLAN
@@ -10,7 +10,7 @@
 
   o  Models and machines
   o  Radix-sorting
-  .  Bit tricks
+  o  Bit tricks
   .  Ranking sets
   .  Bitwise B-trees
   .  Q-Heaps
@@ -26,9 +26,9 @@
 
 *  Ranking combinatorial objects
 
-  .  Ranking of permutations: history
-  .  Linear-time algorithm
-  .  k-permutations
+  o  Ranking and unranking
+  o  Ranking of permutations
+  o  Ranking of k-permutations
   .  Permutations with no fixed point
   .  ?? other objects ??