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Space for dictionary as a string

  • 4 bytes per term for Freq. 

  • 4 bytes per term for pointer to Postings.                         → Now avg. 11 bytes/term,

  • 3 bytes per term pointer                                                               ...Not 20

  • Avg. 8 bytes per term in term string

  • 400K terms x 19 ⇒7.6 MB (against 11.2MB for fixed width)

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