Program: 166807
Project: 166807
Buggy source:
/** 
 * Generate a new stamp for derived sentence by merging the two from parents the first one is no shorter than the second
 * @param first The first Stamp
 * @param second The second Stamp
 */
private Stamp(final Stamp first,final Stamp second,final long time){
  int i1, i2, j;
  i1=i2=j=0;
  baseLength=Math.min(first.length() + second.length(),Parameters.MAXIMUM_EVIDENTAL_BASE_LENGTH);
  evidentialBase=new long[baseLength];
  final long[] firstBase=first.getBase();
  final long[] secondBase=second.getBase();
  while (i2 < second.length() && j < baseLength) {
    evidentialBase[j++]=firstBase[i1++];
    evidentialBase[j++]=secondBase[i2++];
  }
  while (i1 < first.length() && j < baseLength) {
    evidentialBase[j++]=firstBase[i1++];
  }
  final List<Term> chain1=first.getChain();
  final List<Term> chain2=second.getChain();
  i1=chain1.size() - 1;
  i2=chain2.size() - 1;
  derivationChain=new ArrayList<>(baseLength);
  j=0;
  while (j < Parameters.MAXIMUM_DERIVATION_CHAIN_LENGTH && (i1 >= 0 || i2 >= 0)) {
    if (j % 2 == 0) {
      if (i1 >= 0) {
        final Term c1i1=chain1.get(i1);
        if (!derivationChain.contains(c1i1)) {
          derivationChain.add(c1i1);
        }
 else {
          j--;
        }
        i1--;
      }
    }
 else {
      if (i2 >= 0) {
        final Term c2i2=chain2.get(i2);
        if (!derivationChain.contains(c2i2)) {
          derivationChain.add(c2i2);
        }
 else {
          j--;
        }
        i2--;
      }
    }
    j++;
  }
  Collections.reverse(derivationChain);
  creationTime=time;
  occurrenceTime=first.getOccurrenceTime();
}

Fixed version (ground truth):
/** 
 * Generate a new stamp for derived sentence by merging the two from parents the first one is no shorter than the second
 * @param first The first Stamp
 * @param second The second Stamp
 */
private Stamp(final Stamp first,final Stamp second,final long time){
  int i1, i2, j;
  i1=i2=j=0;
  baseLength=Math.min(first.length() + second.length(),Parameters.MAXIMUM_EVIDENTAL_BASE_LENGTH);
  evidentialBase=new long[baseLength];
  final long[] firstBase=first.getBase();
  final long[] secondBase=second.getBase();
  int firstLength=firstBase.length;
  int secondLength=secondBase.length;
  while (i2 < secondLength && j < baseLength) {
    evidentialBase[j++]=secondBase[i2++];
  }
  while (i1 < firstLength && j < baseLength) {
    evidentialBase[j++]=firstBase[i1++];
  }
  final List<Term> chain1=first.getChain();
  final List<Term> chain2=second.getChain();
  i1=chain1.size() - 1;
  i2=chain2.size() - 1;
  derivationChain=new ArrayList<>(baseLength);
  j=0;
  while (j < Parameters.MAXIMUM_DERIVATION_CHAIN_LENGTH && (i1 >= 0 || i2 >= 0)) {
    if (j % 2 == 0) {
      if (i1 >= 0) {
        final Term c1i1=chain1.get(i1);
        if (!derivationChain.contains(c1i1)) {
          derivationChain.add(c1i1);
        }
 else {
          j--;
        }
        i1--;
      }
    }
 else {
      if (i2 >= 0) {
        final Term c2i2=chain2.get(i2);
        if (!derivationChain.contains(c2i2)) {
          derivationChain.add(c2i2);
        }
 else {
          j--;
        }
        i2--;
      }
    }
    j++;
  }
  Collections.reverse(derivationChain);
  creationTime=time;
  occurrenceTime=first.getOccurrenceTime();
}