[Haskell-beginners] Trouble understanding the type of sequence [Just, Just]

[Imants Cekusins]

> when we call sequence [Just 1, Just 2] we should get back
a Just of [1,2]. Following that train of thoughts, shouldn't sequence
[Just, Just] return a single Just?

What would sequence [Just 1, Nothing] return in this case?  Just 1 and
Nothing are of the same type - they must be: they are part of the same list.
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