Program: 166650
Project: 166650
Buggy source:
/** 
 * {<M --> S>, <C ==> <M --> P>>} |- <(&&, <#x --> S>, C) ==> <#x --> P>> {<M --> S>, (&&, C, <M --> P>)} |- (&&, C, <<#x --> S> ==> <#x --> P>>)
 * @param oldCompound The whole contentInd of the first premise, Implicationor Conjunction
 * @param nal Reference to the memory
 */
static boolean introVarInner(final Statement premise1,final Statement premise2,final CompoundTerm oldCompound,final DerivationContext nal){
  final Task task=nal.getCurrentTask();
  final Sentence taskSentence=task.sentence;
  if (!taskSentence.isJudgment() || (premise1.getClass() != premise2.getClass()) || oldCompound.containsTerm(premise1)) {
    return false;
  }
  final Term subject1=premise1.getSubject();
  final Term subject2=premise2.getSubject();
  final Term predicate1=premise1.getPredicate();
  final Term predicate2=premise2.getPredicate();
  final Term commonTerm1;
  final Term commonTerm2;
  if (subject1.equals(subject2)) {
    commonTerm1=subject1;
    commonTerm2=secondCommonTerm(predicate1,predicate2,0);
  }
 else   if (predicate1.equals(predicate2)) {
    commonTerm1=predicate1;
    commonTerm2=secondCommonTerm(subject1,subject2,0);
  }
 else {
    return false;
  }
  final Sentence belief=nal.getCurrentBelief();
  final Map<Term,Term> substitute=new HashMap<>();
  boolean b1=false, b2=false;
{
    final Variable varDep2=new Variable("String_Node_Str");
    Term content=Conjunction.make(premise1,oldCompound);
    if (!(content instanceof CompoundTerm))     return false;
    substitute.put(commonTerm1,varDep2);
    content=((CompoundTerm)content).applySubstitute(substitute);
    final TruthValue truth=intersection(taskSentence.truth,belief.truth,nal.narParameters);
    final BudgetValue budget=BudgetFunctions.forward(truth,nal);
    b1=(nal.doublePremiseTask(content,truth,budget,false,false)) != null;
  }
  substitute.clear();
{
    final Variable varInd1=new Variable("String_Node_Str");
    final Variable varInd2=new Variable("String_Node_Str");
    substitute.put(commonTerm1,varInd1);
    if (commonTerm2 != null) {
      substitute.put(commonTerm2,varInd2);
    }
    Term content=Implication.make(premise1,oldCompound);
    if ((content == null) || (!(content instanceof CompoundTerm))) {
      return false;
    }
    content=((CompoundTerm)content).applySubstituteToCompound(substitute);
    final TruthValue truth;
    if (premise1.equals(taskSentence.term)) {
      truth=induction(belief.truth,taskSentence.truth,nal.narParameters);
    }
 else {
      truth=induction(taskSentence.truth,belief.truth,nal.narParameters);
    }
    final BudgetValue budget=BudgetFunctions.forward(truth,nal);
    b2=nal.doublePremiseTask(content,truth,budget,false,false) != null;
  }
  return b1 || b2;
}

Fixed version (ground truth):
/** 
 * {&lt;M --&gt; S&gt;, &lt;C ==&gt; &lt;M --&gt; P&gt;&gt;} |- &lt;(&amp;&amp;, &lt;#x --&gt; S&gt;, C) ==&gt; &lt;#x --&gt; P&gt;&gt; {&lt;M --&gt; S&gt;, (&amp;&amp;, C, &ltM --&gt; P&gt;)} |- (&amp;&amp;, C, &lt;&lt;#x --&gt; S&gt; ==&gt; &lt;#x --&gt; P&gt;&gt;)
 * @param oldCompound The whole contentInd of the first premise, Implicationor Conjunction
 * @param nal Reference to the memory
 */
static boolean introVarInner(final Statement premise1,final Statement premise2,final CompoundTerm oldCompound,final DerivationContext nal){
  final Task task=nal.getCurrentTask();
  final Sentence taskSentence=task.sentence;
  if (!taskSentence.isJudgment() || (premise1.getClass() != premise2.getClass()) || oldCompound.containsTerm(premise1)) {
    return false;
  }
  final Term subject1=premise1.getSubject();
  final Term subject2=premise2.getSubject();
  final Term predicate1=premise1.getPredicate();
  final Term predicate2=premise2.getPredicate();
  final Term commonTerm1;
  final Term commonTerm2;
  if (subject1.equals(subject2)) {
    commonTerm1=subject1;
    commonTerm2=secondCommonTerm(predicate1,predicate2,0);
  }
 else   if (predicate1.equals(predicate2)) {
    commonTerm1=predicate1;
    commonTerm2=secondCommonTerm(subject1,subject2,0);
  }
 else {
    return false;
  }
  final Sentence belief=nal.getCurrentBelief();
  final Map<Term,Term> substitute=new HashMap<>();
  boolean b1=false, b2=false;
{
    final Variable varDep2=new Variable("String_Node_Str");
    Term content=Conjunction.make(premise1,oldCompound);
    if (!(content instanceof CompoundTerm))     return false;
    substitute.put(commonTerm1,varDep2);
    content=((CompoundTerm)content).applySubstitute(substitute);
    final TruthValue truth=intersection(taskSentence.truth,belief.truth,nal.narParameters);
    final BudgetValue budget=BudgetFunctions.forward(truth,nal);
    b1=(nal.doublePremiseTask(content,truth,budget,false,false)) != null;
  }
  substitute.clear();
{
    final Variable varInd1=new Variable("String_Node_Str");
    final Variable varInd2=new Variable("String_Node_Str");
    substitute.put(commonTerm1,varInd1);
    if (commonTerm2 != null) {
      substitute.put(commonTerm2,varInd2);
    }
    Term content=Implication.make(premise1,oldCompound);
    if ((content == null) || (!(content instanceof CompoundTerm))) {
      return false;
    }
    content=((CompoundTerm)content).applySubstituteToCompound(substitute);
    final TruthValue truth;
    if (premise1.equals(taskSentence.term)) {
      truth=induction(belief.truth,taskSentence.truth,nal.narParameters);
    }
 else {
      truth=induction(taskSentence.truth,belief.truth,nal.narParameters);
    }
    final BudgetValue budget=BudgetFunctions.forward(truth,nal);
    b2=nal.doublePremiseTask(content,truth,budget,false,false) != null;
  }
  return b1 || b2;
}