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MB3 103a: Reading Letters, Murals and Plaques on Shabbos (307:12-15)
Reading off a list on Shabbos and "גזירה שמא יקרא בשטרי הדיוטות". Reading documents, inventory lists, and letters on Shabbos. Reading a letter on Shabbos that was brought from outside the techum. Looking at murals with captions.