or download this
(W once) Typographical errors often show up as unique variable nam
+es.
If you had a good reason for having a unique name, then just menti
+on it
...
%c, *c, &c, sub c{}, c(), and c (the filehandle or format) are con
+sidered
the same; if a program uses $c only once but also uses any of the
+others it
will not trigger this warning.