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What do the letters stand for?
I think the M stands for Memory.
What about the R, S, C and +?

The image you posted shows you have mastered the usage of a layout manager and now should be able to add another column of buttons to your GUI.
Can you explain what your problem is?

How are you adding components to the GUI? What layout manager?
I assume you want to add a column of buttons on the left of the "keyboard".

What is your problem adding the column of components in...