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Table 1 Word-based N-gram feature template

From: Data and knowledge-driven named entity recognition for cyber security

Type Feature template
2-gram xi−1xi,xixi+1
3-gram xi−2xi−1xi,xixi+1xi+2
4-gram xi−3xi−2xi−1xi,xixi+1xi+2xi+3
5-gram xi−4xi−3xi−2xi−1xi,xixi+1xi+2xi+3xi+4