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Table 3 Labels for the CRF model.

From: CHEMDNER system with mixed conditional random fields and multi-scale word clustering

No. Label Explanation
1 B beginning of a normal sequence
2 M middle of a normal sequence
3 E end of a normal sequence
4 S single-token normal sequence
5 B_NER, beginning of a NER sequence
6 M_NER middle of a NER sequence
7 E_NER, end of a NER sequence
8 S_NER single-token NER sequence