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信息发布者：
greet
start
spell
unit
conversation 
bell
everyone
each
other
greet people
each other
say hi to
go to class
Good
morning
What's
your
name
My
name
is
Nice
to
meet
you
How
do
you
spell
How
are
you
I'm
fine
thank
you
Let's
go
to
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