Sir, my mentor has asked that I respond to your query concerning the evolution of the Sumerian alphabet. Although he has a nodding acquittance with that alphabet, I have made an extensive study of the subject. I have written an article on the topic that is forthcoming in
The Journal of Really, Really Old Alphabets. Hence, my research is not yet available to the public through Wikipedia and other electronic sources.
The earliest date in your exhibit is 3,000 BC. This date follows the trade contacts between the Sumerians and Lhasa Apsoians. Prior to that time, the Sumerians used "u" and "sa" to denote males and females, respectively. My article offers a scientific explanation of the adoption of the letter "L" by the Sumerians and their rather idiosyncratic use of the letter in gender identification.
If you will excuse me, I must return to my lab. I am attempting to develop an improved cleaner for X-ray vision glasses.
Sincerely,
Pipette
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