| 21. | Procedural parameters as a programming language feature were introduced by ALGOL 60.
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| 22. | An S-algol program is a sequence of declarations and clauses.
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| 23. | S-algol attempts to improve this by providing less restrictive syntax.
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| 24. | Dynamically-valued constants originated as a language feature with ALGOL 68.
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| 25. | ALGOL introduced the use of block structure and lexical scope.
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| 26. | Others advocated the opposite convention, including IBM for writing Algol programs.
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| 27. | The language itself was an extended version of Algol 60.
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| 28. | He was also involved in the design of Algol 68.
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| 29. | Another phenomenon observed in certain Algol binaries has been monotonic period increases.
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| 30. | The article about ALGOL is not quite explicit about this.
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