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A survey of the October 2001 release of the Cambridge Structural Database [Cambridge Structural Database (1992). Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, England] has uncovered approximately 675 separate apparently reliable entries under space groups 
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and 
; in approximately 100 of these entries, the space-group assignment appears to be incorrect. Other features of these space groups are also discussed.
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and 
; in approximately 100 of these entries, the space-group assignment appears to be incorrect. Other features of these space groups are also discussed.This article has 68 supporting items.
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