opencog
                                
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                        Sureal examples return Error
Running Sureal examples results in a Bug report error
ERROR: In procedure opencog-extension:
Throw to key `C++-EXCEPTION' with args `("sureal-match" "BUG! Still have ungrounded clauses!! (/home/mani/sources/CoreDumpers/externals/ai/open-cog/atomspace/opencog/query/NextSearchMixin.cc:154)\nFunction args:\n((SetLink\n  (InheritanceLink\n    (PredicateNode \"drink\" (stv 9.75697e-13 0.00124844))\n    (DefinedLinguisticConceptNode \"past\" (stv 9.75697e-13 0.00124844)))\n  (EvaluationLink\n    (PredicateNode \"drink\" (stv 9.75697e-13 0.00124844))\n    (ListLink\n      (ConceptNode \"she\"))))\n)")'.
FWIW, at this time, sureal is unmaintained.