Question: Eve is observing a CBC ciphertext and sees that two blocks of ciphertext are identical. What non - trivial property of the plaintexts will Eve

Eve is observing a CBC ciphertext and sees that two blocks of ciphertext are
identical. What non-trivial property of the plaintexts will Eve deduce? If
instead, it was the counter mode (CTR), then will having duplicate blocks of
ciphertext leak anything?
proof mathematically

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