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Thue is an esoteric programming language designed in the 1960s by James M. Plank. It operates using substitutions for strings of characters within an initial program. Each substitution rule consists of two parts: a triggering string and a replacement string. When Thue encounters the triggering string while executing, it replaces this string with the replacement one and continues until no further replacements can be made. This causes the language to execute slowly, making it impractical for most purposes — including as a learning tool or amusement among programmers due to its inefficient computing method compared to other esolangs like Brainfuck or Malbolge.

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