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Alvis keywords
agent, alt, critical, delay, environment, every, exec, exit, fail, in, jump, loop, null, out, proc, select, start, success
Remark 1: Alvis uses the Haskell functional language thus Haskell keywords are also treated as Alvis keywords.
Remark 2: Some of the keywords are not permissible in the current compiler version, but are expected to be used in the previous Alvis versions.