keybindings already taken

[gfp <gfp@posteo.at>]

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Hi,

I wanted to work in a table in org-mode and use the keybinding:

M-S-DOWN (org-table-insert-row)

     Insert a new row above the current row. With a prefix argument, the 
line is created below the current one.

But this keybinding M-S-DOWN is already taken by my MATE Desktop.
So, what can I do?

That´s why I can also not use it with a prefix argument.

I have to use:
M-x org-table-insert-row
but this doesn´t allow a prefix argument.
Are there solutions for that?

thanks
Gottfried

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