Simple, Fair and Terminating Backtracking Monad
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This Haskell library provides an implementation of the MonadPlus type
class that enumerates results of a non-deterministic computation by
interleaving subcomputations in a way that has usually much better
memory performance than other strategies with the same termination
properties.
More information is available on the authors website:
http://okmij.org/ftp/Computation/monads.html#fair-bt-stream