Valid Flags before nested block {}

        Hi,

        More questions for my Lint parser...What are the valid flags
        before the nested block, my first guess is that only H and B
        are meaningfull and possibly a lockfile.
 
        :0 HB : nest.lock
        { 

            :0
            * asdas
            ...

            :0 e
            do-it-here

        }

        fhb   = would be errourneos
        Wwirc = would be meaningless
    
        Right? Also is there anything that would concern the lockfile?
        Should it be used at all?

        I'm also bit uncertain when to use a over A and e over E,
        would someone give clear examples. (Can the use of a over A
        be checked by the Lint somehow: any rules?)

        jari