alpar [Wed, 04 Feb 2004 12:34:15 +0000] rev 57
To make clear, clean() became clear().
alpar [Wed, 04 Feb 2004 11:55:27 +0000] rev 56
Some correction proposed by Marci.
alpar [Tue, 03 Feb 2004 13:41:46 +0000] rev 55
aNode(), bNode(), head() and tail() added