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In evaluating extractive summarization, which metric takes into account the longest common subsequence (LCS) between the generated summary and the reference summary?
①ROUGE-N (measures n-gram-based overlap)
②ROUGE-L (evaluation based on the Longest Common Subsequence)
③BLEU (used for translation evaluation)
④METEOR (considers lexical matching and synonyms)
⑤F1 score (derived from precision and recall in classification)