Combining image targets with a multi target

Hi, I have been having a tough time figuring this one out trying to help a great student of mine. After triggering animations using image targets I would like to use a multitarget to trigger a new animation.

say Target 1 is a triangle, T2 is a square, T3 is a circle. Each have individual animations. I would like to bring them together and instead of playing the individual animation, it plays a different one because the targets were brought together as one piece (multitarget).  Does anyone have an idea about this? Would help a lot :)