modify abbr postprocess

lzr265946

2023-03-21 2ab8b7f473d37299f6774e98179767fe4be6a0f2

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p.m.    PM
p.m    PM
pm    PM
P.M.    PM
P.M    PM
PM    PM
a.m.    AM
a.m    AM
am    AM
A.M.    AM
A.M    AM
AM    AM