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open FO, ">test.txt";
binmode FO, ":utf8";
print FO "\u00b9"

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print FO "\u-00b9";  # Outputs -00b9
print FO "\u{00b9}"; # Outputs {00b9}
print FO "\x{00b9}"; # Outputs a strange character (the code for 00b9 
+is a superscript 1}