Backtracking logic-programming monad

 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.
 .
 It is a continuation-based, backtracking, logic programming monad. An
 adaptation of the two-continuation implementation found in the paper
 Backtracking, Interleaving, and Terminating Monad Transformers available
 here: http://okmij.org/ftp/papers/LogicT.pdf