On Wed, 16 Jun 1999 05:40:00 -0700, Ken wrote:
>  I think question 62 is invalid by reason of it's wording. Csg's are not
>primitives and are regarded as operations.

I'm using primitive in a different sense than you are.  There
are five CSG operations, counting inverse, but only three of 
them are primitive operations (as the term is used in Forth
programming) The other two can be expressed in terms of the 
three primitives, and one actually is expressed that way in 
the source.

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