Purge can break contour styles
If a text style only exists in your drawing within a contour style, AutoCAD’s purge command considers it unused.
Workarounds: Create your contour stiyles using a text style that you know will never be purgeable.
First Appeared: Land Desktop 2 (2000)
Status as of 2008: Still reproducible
Status as of 2009: (unknown)
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