fix bug for contextual train

shixian.shi

2023-11-24 34b2682fba92bf4f8e163d22094e7de57e3290ca

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.