[Haskell-cafe] <**> for nested applicative functors?

[Kim-Ee Yeoh]

Does anyone know if it's possible to write the following:

<**> :: (Applicative m, Applicative n) =>
m (n (a->b)) -> m (n a) -> m (n b)

Clearly, if m and n were monads, it would be trivial.

Rereading the original paper, I didn't see much discussion
about such nested app. functors. 

Any help appreciated.

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