update raw_text handling

shixian.shi

2024-02-21 571dc8b55a9b036a5b36f968bb3a5baf5858e395

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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.