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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

... t, but with the tongue curled back) (t, th, d, dh, n) Dental (tongue against teeth, like Spanish) (t, th, d, dh, n) Labial (with the lips[?]) (p, ph, b, bh, m) It ...