Please add more cases to the test suite, or else it is trivial to solve this problem.
Rafael is right and since you made this into a badge problem it is even more essential to fix this
Specific Element Count
Your favourite city!
Area of a circle
NaN (欠損値) が含まれている行を削除しよう
Find Logic 17
Find Logic 12
Find Logic 15
Find Logic 5
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