### Define list monad operations using comprehensions

Define list monad operations using list comprehensions. Code using monad operations with lists did not fuse fully. Writing list code with `do` notation or `(>>=)` and `(>>)` operations could allocate more than equivalent code using list comprehensions. Define `mapM` directly, instead of using `sequence` and `map`. This leads to substantially less allocation in `cryptarithm2`. Addresses #9781 Reviewed By: ekmett, nomeata Differential Revision: https://phabricator.haskell.org/D455

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