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    		how to debug

    1	Overview

    2	debug mode and debug level
    2.1	Debug mode
    2.2	Debug mode level 2

    3	How to debug
    3.1	How to debug (1)
    3.2	How to debug (2)
    3.3	printf debug

    4	Command Line Options
    4.1	syntaxes of command line options
    4.2	Long line option style --\S+=\S+
    4.3	configuration files and command line options
    4.4	simple mode setting option --\S+
    4.5	--ctladdr

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