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Csd
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        equal or lower than the low-water mark.  These end conditions
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Csd
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    factory to a utility function (e.g., EventLoop.create_connection()).

    When the connection is made successfully, connection_made() is
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    transport; finally, connection_lost() will be called exactly once
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    State machine of calls:

      start -> CM [-> DR*] [-> ER?] -> CL -> end

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Csd
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Csd
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Csd
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