Wed, 27 Oct 1999 12:50:48 +0200 got rid of split_diff, which duplicated nat_diff_split, and
paulson [Wed, 27 Oct 1999 12:50:48 +0200] rev 7945
got rid of split_diff, which duplicated nat_diff_split, and also disposed of remove_diff_ss
(0) -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip