When applying a pattern, we don't need to have a description of classes or objects that participate in the pattern.

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When applying a pattern, it is essential to have a description of the classes or objects that participate in the pattern, as this helps in understanding how the pattern works and how it can be implemented within the system. Patterns are about reusing designs, and knowing the roles of participating classes or objects is crucial for their correct application.

When Applying a Pattern, We Don't Need to Have a Description