根据表格序列H，回答问题Q。
问题Q：How many sentence pairs does the WMT14 English-German corpus contain?
表格序列H：<C> Yang et al . ,14.52, NAME_1 and NAME_2 ( 2019 ) ( our reproduction ),22.1, NAME_3 et al . ( 2019b ) ( our reproduction ),22.8, CSP and fine - tuning ( ours ),<max>23.9<bold>,<C> Yang et al . ,15.58, NAME_1 et al . ( 2018b ),24.18, NAME_1 and NAME_2 ( 2019 ),33.3, NAME_3 et al . ( 2019b ),<max>34.6<bold>, NAME_1 and NAME_2 ( 2019 ) ( our reproduction ),33.5, NAME_3 et al . ( 2019b ) ( our reproduction ),34.1, CSP and fine - tuning ( ours ),34.5,<C> Yang et al . ,10.86, NAME_1 et al . ( 2018b ),17.16, NAME_1 and NAME_2 ( 2019 ),27.0, NAME_3 et al . ( 2019b ),28.1, NAME_1 and NAME_2 ( 2019 ) ( our reproduction ),27.3, NAME_3 et al . ( 2019b ) ( our reproduction ),27.9, CSP and fine - tuning ( ours ),<max>28.7<bold>,<C> Yang et al . ,14.62, NAME_1 et al . ( 2018b ),21.0, NAME_1 and NAME_2 ( 2019 ),34.3, NAME_3 et al . ( 2019b ),35.0, NAME_1 and NAME_2 ( 2019 ) ( our reproduction ),33.8, NAME_3 et al . ( 2019b ) ( our reproduction ),34.7, CSP and fine - tuning ( ours ),<max>35.7<bold>,<C> Yang et al . ,16.97, NAME_1 et al . ( 2018b ),25.14, NAME_1 and NAME_2 ( 2019 ),33.4, NAME_3 et al . ( 2019b ),37.5, NAME_1 and NAME_2 ( 2019 ) ( our reproduction ),32.9, NAME_3 et al . ( 2019b ) ( our reproduction ),37.3, CSP and fine - tuning ( ours ),<max>37.9<bold>,Yang et al. (2018) 10.86 14.62 16.97 15.58 14.52 NAME_1 et al. (2018b) 17.16 21.0 25.14 24.18 -NAME_1 and NAME_2 (2019) 27.0 34.3 33.4 33.3 -NAME_3 et al. (2019b) 28.1 35.0 37.5 34.6 -NAME_1 and NAME_2 (2019) (our reproduction) 27.3 33.8 32.9 33.5 22.1 NAME_3 et al. (2019b) (our reproduction) 27.9 34.7 37.3 34.1 22.8 CSP and fine-tuning (ours) 28.7 35.7 37.9 34.5 23.9 Table 1: The translation performance of the fine-tuned unsupervised NMT models. To reproduce the results of NAME_1 and NAME_2 (2019) and NAME_3 et al. (2019b), we directly run their released codes on the website.
 Provide the entire answer in JSON format.
user