[Haskell-beginners] Question about example in 'using do notation with Writer' section of LYH

[Imants Cekusins]

> what becomes of the string parts of the Writer monads

multWithLog keeps [String] and outputs Int

to fully benefit from Writer [String] Int, you'd call e.g. runWriter
or execWriter

similar to other *State state out* monads,

*m state out* lets you get/set/keep state as needed without passing it as
an arg. *state* is there if you need it.
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