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The AES and the Sigma
This is a silly little question that may have no answer. I've searched here as well as googled and haven't come up with anything.
At the risk of sounding like OldU, I noticed that almost all of the AES sororities used at least one Sigma in their letters. The letter Sigma is quite underrepresented in the pre-1951 NPC groups, with Sigma Kappa being the only exception.
Obviously I am not looking for secret or ritual information. I was sort of curious if there was a reason the Sigma was so prevalent in the AES?
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