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Table 4 Character-based feature sets in CRFs model.

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

Character feature Wi-4, Wi-3, Wi-2, Wi-1, Wi, Wi+1, Wi+2, Wi+3, Wi+4
2-gram character feature Wi-1i, Wii+1
3-gram character feature Wi-2i, Wi-1i+1, Wii+2
4-gram character feature Wi-3i, Wi-2i+1, Wi-1i,Wii+1
5-gram character feature Wi-4i, Wi-3i+1, Wi-2i+2, Wi-1i+3, Wii+4