Reverse Unicode code points, whitespace-delimited token order, and physical line order as three separate results.
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Character mode reverses code-point iteration, word mode reverses alternating text and whitespace tokens, and line mode reverses CRLF/LF rows. Code-point iteration preserves surrogate pairs, while line reconstruction uses LF.
Hello, World!
Characters: !dlroW ,olleH Words: World! Hello, Lines: Hello, World!
Wordplay puzzles reverse phrases, editors invert pasted lists, and Unicode lessons contrast code points with grapheme clusters.