Answers are grounded in this paper and cite their sources.
Lars Hellsten, Brian Roark, Prasoon Goyal, Cyril Allauzen, Françoise Beaufays, Tom Ouyang, Michael Riley, David Rybach. Proceedings of the 13th International Conference on Finite State Methods and Natural Language Processing (FSMNLP 2017). 2017.
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Hellsten et al. (2017) studied this question.