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    via Stack Overflow by user3432694
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  • GitHub comment 2#67494836
    via GitHub by Wouter1
  • GitHub comment 58#109175781
    via GitHub by etsardou
    • jpl.PrologException: PrologException: error(existence_error(procedure, /(isAt, 3)), context(:(system, /('$c_call_prolog', 0)), _1)) at jpl.Query.get1( at jpl.Query.hasMoreSolutions( at jpl.Query.hasMoreElements(
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