Program: 52719
Project: 52719
Buggy source:
private StemNode[] generateModifiedRootNodes(DictionaryItem dicItem){
  if (dicItem.hasAttribute(RootAttribute.Special))   return handleSpecialStems(dicItem);
  TurkicSeq modifiedSeq=new TurkicSeq(dicItem.pronunciation,alphabet);
  EnumSet<PhoneticAttribute> originalAttrs=calculateAttributes(dicItem.pronunciation);
  EnumSet<PhoneticAttribute> modifiedAttrs=originalAttrs.clone();
  EnumSet<PhoneticExpectation> originalExpectations=EnumSet.noneOf(PhoneticExpectation.class);
  EnumSet<PhoneticExpectation> modifiedExpectations=EnumSet.noneOf(PhoneticExpectation.class);
  for (  RootAttribute attribute : dicItem.attributes) {
switch (attribute) {
case Voicing:
      TurkicLetter last=modifiedSeq.lastLetter();
    TurkicLetter modifiedLetter=alphabet.voice(last);
  if (modifiedLetter == null) {
    throw new LexiconException("String_Node_Str" + dicItem);
  }
if (dicItem.lemma.endsWith("String_Node_Str")) modifiedLetter=TurkishAlphabet.L_g;
modifiedSeq.changeLetter(modifiedSeq.length() - 1,modifiedLetter);
modifiedAttrs.remove(PhoneticAttribute.LastLetterVoicelessStop);
originalExpectations.add(PhoneticExpectation.ConsonantStart);
modifiedExpectations.add(PhoneticExpectation.VowelStart);
break;
case Doubling:
modifiedSeq.append(modifiedSeq.lastLetter());
originalExpectations.add(PhoneticExpectation.ConsonantStart);
modifiedExpectations.add(PhoneticExpectation.VowelStart);
break;
case LastVowelDrop:
modifiedSeq.delete(modifiedSeq.length() - 2);
if (!dicItem.primaryPos.equals(PrimaryPos.Verb)) originalExpectations.add(PhoneticExpectation.ConsonantStart);
modifiedExpectations.add(PhoneticExpectation.VowelStart);
break;
case InverseHarmony:
originalAttrs.add(PhoneticAttribute.LastVowelFrontal);
originalAttrs.remove(PhoneticAttribute.LastVowelBack);
modifiedAttrs.add(PhoneticAttribute.LastVowelFrontal);
modifiedAttrs.remove(PhoneticAttribute.LastVowelBack);
break;
case ProgressiveVowelDrop:
modifiedSeq.delete(modifiedSeq.length() - 1);
if (modifiedSeq.hasVowel()) {
modifiedAttrs=calculateAttributes(modifiedSeq);
}
break;
default :
break;
}
}
StemNode original=new StemNode(dicItem.root,dicItem,originalAttrs,originalExpectations);
StemNode modified=new StemNode(modifiedSeq.toString(),dicItem,modifiedAttrs,modifiedExpectations);
SuffixData[] roots=suffixProvider.defineSuccessorSuffixes(dicItem);
original.exclusiveSuffixData=roots[0];
modified.exclusiveSuffixData=roots[1];
if (original.equals(modified)) return new StemNode[]{original};
modified.setTermination(TerminationType.NON_TERMINAL);
if (dicItem.hasAttribute(RootAttribute.CompoundP3sgRoot)) original.setTermination(TerminationType.NON_TERMINAL);
return new StemNode[]{original,modified};
}

Fixed version (ground truth):
private StemNode[] generateModifiedRootNodes(DictionaryItem dicItem){
  if (dicItem.hasAttribute(RootAttribute.Special))   return handleSpecialStems(dicItem);
  TurkicSeq modifiedSeq=new TurkicSeq(dicItem.pronunciation,alphabet);
  EnumSet<PhoneticAttribute> originalAttrs=calculateAttributes(dicItem.pronunciation);
  EnumSet<PhoneticAttribute> modifiedAttrs=originalAttrs.clone();
  EnumSet<PhoneticExpectation> originalExpectations=EnumSet.noneOf(PhoneticExpectation.class);
  EnumSet<PhoneticExpectation> modifiedExpectations=EnumSet.noneOf(PhoneticExpectation.class);
  for (  RootAttribute attribute : dicItem.attributes) {
switch (attribute) {
case Voicing:
      TurkicLetter last=modifiedSeq.lastLetter();
    TurkicLetter modifiedLetter=alphabet.voice(last);
  if (modifiedLetter == null) {
    throw new LexiconException("String_Node_Str" + dicItem);
  }
if (dicItem.lemma.endsWith("String_Node_Str")) modifiedLetter=TurkishAlphabet.L_g;
modifiedSeq.changeLetter(modifiedSeq.length() - 1,modifiedLetter);
modifiedAttrs.remove(PhoneticAttribute.LastLetterVoicelessStop);
originalExpectations.add(PhoneticExpectation.ConsonantStart);
modifiedExpectations.add(PhoneticExpectation.VowelStart);
break;
case Doubling:
modifiedSeq.append(modifiedSeq.lastLetter());
originalExpectations.add(PhoneticExpectation.ConsonantStart);
modifiedExpectations.add(PhoneticExpectation.VowelStart);
break;
case LastVowelDrop:
if (modifiedSeq.lastLetter().isVowel()) {
modifiedSeq.delete(modifiedSeq.length() - 1);
modifiedExpectations.add(PhoneticExpectation.ConsonantStart);
}
 else {
modifiedSeq.delete(modifiedSeq.length() - 2);
if (!dicItem.primaryPos.equals(PrimaryPos.Verb)) {
originalExpectations.add(PhoneticExpectation.ConsonantStart);
}
modifiedExpectations.add(PhoneticExpectation.VowelStart);
}
break;
case InverseHarmony:
originalAttrs.add(PhoneticAttribute.LastVowelFrontal);
originalAttrs.remove(PhoneticAttribute.LastVowelBack);
modifiedAttrs.add(PhoneticAttribute.LastVowelFrontal);
modifiedAttrs.remove(PhoneticAttribute.LastVowelBack);
break;
case ProgressiveVowelDrop:
modifiedSeq.delete(modifiedSeq.length() - 1);
if (modifiedSeq.hasVowel()) {
modifiedAttrs=calculateAttributes(modifiedSeq);
}
break;
default :
break;
}
}
StemNode original=new StemNode(dicItem.root,dicItem,originalAttrs,originalExpectations);
StemNode modified=new StemNode(modifiedSeq.toString(),dicItem,modifiedAttrs,modifiedExpectations);
SuffixData[] roots=suffixProvider.defineSuccessorSuffixes(dicItem);
original.exclusiveSuffixData=roots[0];
modified.exclusiveSuffixData=roots[1];
if (original.equals(modified)) return new StemNode[]{original};
modified.setTermination(TerminationType.NON_TERMINAL);
if (dicItem.hasAttribute(RootAttribute.CompoundP3sgRoot)) original.setTermination(TerminationType.NON_TERMINAL);
return new StemNode[]{original,modified};
}