Can Greece avoid default?

Here is the BBC graph of the Greek payments needed this Summer:

As you can see, even if the Troika releases the last tranche of bailout money (a bit over E7B) it is only enough to cover June. Then in
July and August, Greece needs another E6B each month. Can Greece come up with the money without further aid? The answer is clearly NO. So, the question is will the Troika keep putting in more money? That is what is questionable.