(view source code of uniquechars_php.bat as plain text)
:: https://www.robvanderwoude.com/batchphp.php
:: Usage: UniqueChars.bat "the quick brown fox jumps over the lazy dog" returns " abcdefghijklmnopqrstuvwxyz"
@IF NOT "%~1"=="" PHP.EXE -r "print(count_chars(\"%~1\",3));
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