add option parser; add copyright;

lyblsgo

2023-04-25 1d205d340ff5129e457fa462eb5b31b152086339

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peme    p.m.
pe eme    p.m.
p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
ame    a.m.
a eme    a.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.