Show indices of Last TWO buttons pressed in a boolean array (how to?)

How would you go about showing the indices of the last TWO buttons pressed in an array of buttons, and only after TWO buttons have been pressed? I know how to show the LAST button pressed, and I know how to flag the event of two buttons being pressed (using the modulus), but I can't readily see how to show the indices of the last TWO.
For example, in an array of 24 buttons, someone presses buttons 2 and 7... an indicator says 2 & 7. Those buttons remain pressed. Now the user presses buttons 14 and 3, the same indicator now reads 14 & 3.
The indicator can be text, an int array, two ints, whatever. Any ideas?
Message Edited by LV_Addict on 07-28-2008 01:29 PM

Thanks Ben.
To get the LAST button pressed, I just XOR the array and look for the True, as shown. No biggie.
Yep, I know about the ability to expand the left side S/R to get a histogram, and have used that in the past. It doesn't seem to do anything for me here!
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