for (int k = j; k < end; k++) {
copy[k] = ngTag;
// score the sequence
double ngScore = 0.0;
for (int m = start; m < end; m++) {
double[] scores = ts.scoresOf(copy, m);
scores = Scorer.recenter(scores);
ngScore += scores[tags[m]];
}
prevScores.incrementCount(new Pair<Integer,Integer>(Integer.valueOf(j), Integer.valueOf(k)), ngScore - bgScore);
}