C-c C-s C-c & Sort the summary-buffer by length.\\
C-c C-s C-n & Sort the summary-buffer by article {\bf number}.\\
C-c C-s C-s & Sort the summary-buffer by {\bf subject}.\\
C-c C-s C-c & Sort the summary-buffer by length.\\
C-c C-s C-n & Sort the summary-buffer by article {\bf number}.\\
C-c C-s C-s & Sort the summary-buffer by {\bf subject}.\\