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Mesoamerica Olmecs Cascajal Block Undeciphered writing systems Hieroglyph, others, white, text, rectangle png -
Phaistos Disc Crete Sumer E-zida, divination, medal, ancient History, metal png
Jiahu symbols 7th millennium BC Neolithic Proto-writing, henan, miscellaneous, angle, white png
Dawenkou culture Neolithic The Voynich Manuscript Banpo Chinese characters, symbol, miscellaneous, writing System, wikimedia Commons png
