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In article <Y++xgG### [at] econymdemoncouk> , Mike Williams
<mik### [at] nospamplease> wrote:
> only if *all* the parts are hollow. I.e. substituting "union" or "merge"
> for "light_group" in your code gives exactly the same effect.
Yes, because a light_group internally is a (special) union...
Thorsten
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Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
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