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2019-11-02app/difficulty.py: make the computed difficulty level more reasonableHui Lan
If a word belongs to CET4, then it has level 1. If a word belongs to CET6, then it has level 2. If a word does not belong to either CET4 or CET6, then we need to decide its level using word frequency.
2019-11-01python-files: add copyright noticeHui Lan
2019-11-01englishpal: first commitHui Lan