I agree with Chris and Paul. The predicates are clearly not intended to be mutually disjoint. They are probably intended to capture the most common use cases in single functions (which allows for some aggressive optimization - some day 8^).

Refractions: 3, Jellet: 1 - we win!  8^)

--
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022

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