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以下はSTN のCommand Quick Reference Card からの抜粋である。最も適切な説明文は?

  1. Remove or identify duplicate records from one or more answer sets.
  2. Look at the neighboring terms in a search field to verify that it is a valid search term. Twelve terms are shown by default. To continue down the same index,enter E . If you do not append a search code, the Basic Index is used.
  3. Temporarily end your online session and hold the entire session for 120 minutes at no charge.
  4. Extract terms from display fields and provide statistical analysis. For a list of fields that may be used, enter HELP EFIELDS at an arrow prompt in the database.
  5. Request that current-awareness searches be run automatically when a database or a set of databases is updated.