@samp{A} into @samp{a}, and likewise for each set of equivalent
characters.)
- When you construct a case table, you can provide @code{nil} for both
-@var{canonicalize} and @var{equivalences}. When you specify the case
-table for use, Emacs fills in these strings, computing them from
-@var{upcase} and @var{downcase}. In a case table that is actually in
-use, those components are non-@code{nil}. Do not try to make just one
-of these components @code{nil}; that is not meaningful.
+ When you construct a case table, you can provide @code{nil} for
+@var{canonicalize}; then Emacs fills in this string from @var{upcase}
+and @var{downcase}. You can also provide @code{nil} for
+@var{equivalences}; then Emacs fills in this string from
+@var{canonicalize}. In a case table that is actually in use, those
+components are non-@code{nil}. Do not try to specify @var{equivalences}
+without also specifying @var{canonicalize}.
Each buffer has a case table. Emacs also has a @dfn{standard case
table} which is copied into each buffer when you create the buffer.