Each piece of data has a CF associated with it; even if the parameter is single-valued, there may be multiple possibilities:

COLOR = ((RED .6) (BLUE .3))

Data is referenced using predicates that differ on:

• the CF values that cause the predicate to be ``true''
• the CF value returned by the predicate.

The two most commonly used predicates are:

• SAME: ``True'' if data CF > .2; returns data CF.
• KNOWN: ``True'' if data CF > .2; returns 1.0

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