update infer func for old contextual

shixian.shi

2023-07-06 5690a8bcb314ee53a5db1c704f6e3fe61460c7f6

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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.