People forget that DRY means "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system". The principle concerns t

People forget that DRY means "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system". The principle concerns the duplication of knowledge, not code. Author's reference to "accidental duplication" is caused by two similar code that represents different code that is when joined becomes the code that is ambiguous in meaning.