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Popsi and precis are
1 pre-coordinate indexing systemsa
2 post -cordinate indexing systems

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 Mam...they both comes in Precoordinate indexing system.

pre

KWIC, KWOC, CHAIN, PRECIS & POPSI all are Pre-Coordinate indexing systems.
Uniterm, Zator & Batten are Post-Coordinate Indexing systems and among the Post-Coordinate Systems Uniterm is regarded as the best

Siddhartha S. Ray, Calcutta

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