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$$IC = \frac{\sum_{i=1}^{26} f_i(f_i-1)}{N(N-1)}$$
The IC is calculated by comparing the frequency distribution of letters in the text to the expected frequency distribution of letters in the language. In English, for example, the letter "E" is the most common letter, followed by "T", "A", and so on. index of up 2009
After calculating the IC, we get a value of 0.065. This suggests that the text is likely encrypted. followed by "T"
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