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Table 4 Soundex code for English letters.

From: Chemical entity extraction using CRF and an ensemble of extractors

Soundex Code Letters
1 B, F, P, V
2 C, G, J, K, Q, S, X, Z
3 D, T
4 L
5 M,N
6 R
No Code A, E, I, O, U, H, W, Y