Details

This message is generated when the second argument in Except is a pattern that represents a sequence of expressions.
Patterns based on __, ___, patt..., and p... represent sequences of expressions.
Off[message] switches off the message; On[message] switches it on. For example: Off[Except::lenmod].

Examples

The second argument in Except is a pattern that stands for a sequence of expressions:

Pick the sublists in which all of the elements are odd but not all of the elements are prime:

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