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I. Introduction
   A. Definition of Turnover Rate
   B. Reasons for the Review
II. Measurement of Turnover Rate (or Frequency) or Site Time Yield
   A. Solid Acids
   B. Metals
      1. Structure-Insensitive Reactions
      2. Structure-Sensitive Reactions
      3. How to Measure Upper Values of TOF
III. Applications of TOF Values
   A. Comparisons of Rate Data
   B. Catalytic Cycles
IV. Conclusion
V. References

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