key sequences, not one.@refill
All told, the prefix keys in Emacs are @kbd{C-c}, @kbd{C-h},
-@kbd{C-x}, @kbd{C-x @key{RET}}, @kbd{C-x @@}, @kbd{C-x a}, @kbd{C-x n}, @w{@kbd{C-x
-r}}, @kbd{C-x v}, @kbd{C-x 4}, @kbd{C-x 5}, @kbd{C-x 6}, @key{ESC}, and
-@kbd{M-g}. But this list is not cast in concrete; it is
-just a matter of Emacs's standard key bindings. If you customize Emacs,
-you can make new prefix keys, or eliminate these. @xref{Key Bindings}.
+@kbd{C-x}, @kbd{C-x @key{RET}}, @kbd{C-x @@}, @kbd{C-x a}, @kbd{C-x
+n}, @w{@kbd{C-x r}}, @kbd{C-x v}, @kbd{C-x 4}, @kbd{C-x 5}, @kbd{C-x
+6}, @key{ESC}, and @kbd{M-g}. (@key{F1} and @key{F2} are aliases for
+@kbd{C-h} and @kbd{C-x 6}.) But this list is not cast in concrete; it
+is just a matter of Emacs's standard key bindings. If you customize
+Emacs, you can make new prefix keys, or eliminate these. @xref{Key
+Bindings}.
If you do make or eliminate prefix keys, that changes the set of
possible key sequences. For example, if you redefine @kbd{C-f} as a