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American Chemical Society, Division of Chemical Information, Education Committee: Computer Searching of Chemical Abstracts: STN Proximity Operators.

STN Proximity Operators

Operator Function
(W) or space Terms must be adjacent and in the order specified
(nW) Terms must be adjacent and in the order specified with n or fewer intervening terms
(A) Terms must be adjacent but in any order
(nA) Terms must be adjacent but in any order with n or fewer intervening terms
(L) Terms must occur in same information unit (e.g. title, keyword, or index)

Examples in CA File

You Enter System Response
s gas (w) chromatography L1 20954 GAS (W) CHROMOTAGRAPHY
s gas (a) chromatography L2 44392 GAS (A) CHROMATOGRAPHY
s gas (l) chromatography L3 48054 (L) CHROMATOGRAPHY
s gas and chromatography L4 48922 GAS AND CHROMATOGRAPHY

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