How allow TAB at begining of a line, but expand it to spaces?

Hi,

If I use the above at the modeline, it will expand all TABs in a line. But I just want to keep the TAB at the beginning of a line. Could anybody show me how to modify the line to get this behavior? Thanks.

vim: set expandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8:

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