@Test
public void fastutilLinkedOpenHashMap()
{
final char [] CHARS = DATA;
final Int2IntLinkedOpenHashMap map = new Int2IntLinkedOpenHashMap();
map.defaultReturnValue(0);
for (int i = 0; i < CHARS.length - 1; i++)
{
final int bigram = CHARS[i] << 16 | CHARS[i+1];
map.addTo(bigram, 1);