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List of unsolved problems

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This is a list of articles about unsolved problems in various subjects:

Unsolved problems in mathematics
Unsolved problems in physics
Unsolved problems in chemistry[?]
Unsolved problems in biology
Unsolved problems in economics[?]

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Sanskrit language

... as long as their short counterparts. Also, there exists a third, extra-long length for most vowels, which is used in various cases, but particularly when recording a ...