[MlMt] How to a Smart Folder which contains all replies to some messages?

[leo]

*I sent the same message under the wrong subject, please disregard it. 
My apologies for this. Here comes the topic again with the correct 
subject:*

Hi MailMatelers

For the work with mailing lists I have a (Smart) Folder with some 
interesting first messages which began a thread (like *this* message).

How can I create another Smart Folder which contains all replies to 
these first messages?

Many Thanks,
Leo
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