KASH3 Ref - Difference_

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| ### Function Difference_ ( set S1, list S2 ) ### Description Change `S1' so that it becomes the difference of `S1' and `S2'. The difference is the set of the elements that are in `S1' but not in `S2'. So `Difference_' removes (see `SetRemove_') all elements from `S1' that are in `S2'. Note: `S2' may be a list that is not a proper set, in which case `Set' is silently applied to it.
| Built: Mon Nov 14 21:12:39 UTC 2005 on mack