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  1. or download this
    use strict;
use warnings;
...

print "* TEST LC";
print "$_ -> ",ord($_)  for $SS, "\L$SS", lc($SS);
  2. or download this
    Can't do lc("\x{1E9E}") on non-UTF-8 locale; resolved to "\x{1E9E}". a
+t d:/tmp/job/eszet.pl line 33.
Can't do lc("\x{1E9E}") on non-UTF-8 locale; resolved to "\x{1E9E}". a
+t d:/tmp/job/eszet.pl line 33.
...
ẞ -> 7838
ẞ -> 7838
ẞ -> 7838