Program: 135852
Project: 135852
Buggy source:
private void deriveClauses(){
  boolean selector=false;
  clauses=new LinkedHashSet<>();
  model=grounding.problem().induce();
  if (dataset.size() > 0) {
    if (selector) {
      model.addHide("String_Node_Str");
      model.addShow(String.format("String_Node_Str",UCL));
      model.addClause(String.format("String_Node_Str",UCL));
      int cc=0;
      for (      Clause clause : dataset) {
        cc+=1;
        model.addClause(String.format("String_Node_Str",cc));
        model.addClause(String.format("String_Node_Str",UCL));
        int ll=0;
        for (        Literal literal : clause) {
          ll+=1;
          model.addClause(String.format("String_Node_Str",cc,ll));
        }
      }
    }
 else {
      Map<Integer,StringJoiner> levels=new TreeMap<>();
      StringJoiner minimee=new StringJoiner("String_Node_Str");
      int cc=0;
      for (      Clause clause : dataset) {
        cc+=1;
        Atom head=clause.head();
        Clause simple=new Clause(head.get(Atom.ID_ATOM));
        deriveLevel(cc,0,new Literal(false,head),levels);
        String heads=join(head,Atom.ID_TYPES);
        minimee.add(String.format("String_Node_Str",cc,head.get(Atom.ID_WEIGHT),head.get(Atom.ID_PRIORITY)));
        deriveLiterals(cc,clause,simple,levels,heads,minimee);
        for (        Atom type : head.get(Atom.ID_ACCESSORS).get(Atom.ID_TYPES)) {
          Literal literal=new Literal(false,type);
          if (!simple.contains(literal))           simple.append(literal);
        }
        clauses.add(simple);
        if (levels.size() > 1)         for (        int lvl : levels.keySet()) {
          model.addClause(String.format("String_Node_Str",LEVEL,cc,lvl,levels.get(lvl).toString()));
          model.addConstraint(String.format("String_Node_Str",LEVEL,cc,lvl,LEVEL,cc,lvl + 1));
        }
        model.addFact(String.format("String_Node_Str",CLAUSE,cc));
      }
      model.addHide("String_Node_Str");
      model.addShow(String.format("String_Node_Str",UCL));
      model.addMinimize(String.format("String_Node_Str",minimee.toString()));
      model.addClause(String.format("String_Node_Str",UCL));
    }
  }
}

Fixed version (ground truth):
private void deriveClauses(){
  clauses=new LinkedHashSet<>();
  model=grounding.problem().induce();
  if (dataset.size() > 0) {
    String min="String_Node_Str";
    int cc=0;
    for (    Clause clause : dataset) {
      cc+=1;
      String choices="String_Node_Str";
      Atom head=clause.head();
      Clause simple=new Clause(head.get(Atom.ID_ATOM));
      for (      Atom term : head.get(Atom.ID_ACCESSORS).get(Atom.ID_TYPES)) {
        Literal type=new Literal(false,term);
        if (!simple.contains(type))         simple.append(type);
      }
      int ll=0;
      for (      Literal literal : clause) {
        ll+=1;
        int lvl=convert(literal.get(Atom.ID_LEVEL).toString());
        Literal desired=new Literal(literal.negated(),literal.get(Atom.ID_ATOM));
        if (!simple.contains(desired))         simple.append(desired);
        for (        Atom term : literal.atom().get(Atom.ID_ACCESSORS).get(Atom.ID_TYPES)) {
          Literal type=new Literal(false,term);
          if (!simple.contains(type))           simple.append(type);
        }
        String vars=combine(literal.atom(),Atom.ID_VARS);
        String types=combine(literal.atom(),Atom.ID_TYPES);
        String uses=String.format("String_Node_Str",UCL,cc,ll);
        String tries=String.format("String_Node_Str",TCL,cc,ll,vars);
        String level=String.format("String_Node_Str",LEVEL,cc,lvl);
        min+=(min.isEmpty() ? "String_Node_Str" : "String_Node_Str") + String.format("String_Node_Str",uses,literal.get(Atom.ID_WEIGHT),literal.get(Atom.ID_PRIORITY));
        choices+="String_Node_Str" + tries;
        model.addClause(String.format("String_Node_Str",tries,uses,types));
        model.addClause(String.format("String_Node_Str",tries,uses,types,desired.toString()));
        model.addClause(String.format("String_Node_Str",level,uses));
        if (lvl > 0)         model.addConstraint(String.format("String_Node_Str",cc,lvl - 1,level));
        model.addFact(String.format("String_Node_Str",LITERAL,cc,ll));
      }
      String types=combine(head,Atom.ID_TYPES);
      String uses=String.format("String_Node_Str",UCL,cc);
      min+=(min.isEmpty() ? "String_Node_Str" : "String_Node_Str") + String.format("String_Node_Str",uses,head.get(Atom.ID_WEIGHT),head.get(Atom.ID_PRIORITY));
      model.addClause(String.format("String_Node_Str",UCL,CLAUSE,LITERAL));
      model.addClause(String.format("String_Node_Str",LEVEL,cc,UCL,cc));
      model.addClause(String.format("String_Node_Str",simple.head().toString(),uses,choices,types));
      model.addFact(String.format("String_Node_Str",CLAUSE,cc));
      clauses.add(simple);
    }
    model.addHide("String_Node_Str");
    model.addShow(String.format("String_Node_Str",UCL));
    model.addClause(String.format("String_Node_Str",UCL));
    if (!min.isEmpty())     model.addClause(String.format("String_Node_Str",min));
  }
}