Calling iterator.next() through a TreeSet [example from Thinking In Java]

See more:

C++

C#

Java

Reading Containers in Depth chapter from the Thinking In Java book. Saw this example(modified from SortedMapDemo.java):

TreeSet<String> sortedSet = new TreeSet<String>();
Collections.addAll(sortedSet,
          "a b c d e f g h"
            .split(" "));

...

Iterator<String> it = sortedSet.iterator();
for(int i = 0; i <= 6; i++) {
if(i == 3) low = it.next();
if(i == 6) high = it.next();
else it.next();
}
print(low);
print(high);

What baffles me is that while 'low' prints out "d", 'high' prints out "h", for which I think should be "g" instead.
If we're calling it.next() in each iteration, shouldn't the 7th iteration gives "g"??