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My VK channel is https://vk.com/yellow.school There are 100 coins on the table: 10 rows of 10 coins each. 10 coins out of 100 are tails up, and the remaining 90 are heads up. Where these 10 coins are and how they are arranged among the 100 - you do not know. You are wearing a mask through which nothing is visible, and gloves so that you cannot tell by touch which side the coins are lying.