| 21. | There is no hard and fast rule to what gets accepted or not.
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| 22. | It's only a guideline; there's no hard and fast rule.
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| 23. | Naming conventions are just that-conventions, guidelines-not hard and fast rules.
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| 24. | However, I'm confident there is no hard and fast rule.
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| 25. | Note that these temperatures are not hard and fast rules.
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| 26. | There is no hard and fast rule for acquiring the works of young artists.
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| 27. | Therefore, there is no hard and fast rule to select the optimal beam size.
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| 28. | "It's a hard and fast rule, whether the home is in Boston, Mattapan, whatever.
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| 29. | :: So I'm not sure about hard and fast rules.
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| 30. | There are no hard and fast rules of classification; different scholars emphasise different features.
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