Description: According to an English text file, the frequency of appearance of 26 letters is not case sensitive. Assuming that the memory is large enough, you can read the file one at a time.
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File list (Check if you may need any files):
| Filename | Size | Date |
|---|
| zifu.c | 2490 | 2017-12-29
|
| 个人选题.docx | 18982 | 2017-12-30 |
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