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    MarkBlockBegin      <Ctrl KB> or <Esc><B><B>
    -------------------------------------------------------------------------

    Marks the beginning of a character Block.  The Block is not shown
    until the MarkBlockEnd command is executed at some position beyond
    the beginning position of the Block.  For an alternate method of
    marking character Blocks, refer to the DropAnchor and MarkCharacter
    commands.