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in a time-to-event setting. This function follows a special decision rule in order to determine
whether two or three phase III trials should be conducted. First, two phase III trials are performed. Depending
on their success, the decision for a third phase III trial is made:</p><ul><li><p>If both trials are successful, no third phase III trial will be conducted.</p></li>
<li><p>If only one of the two trials is successful and the other trial has a treatment effect that points in the same direction,
a th