text:  And that means you have, for example, four or five arms. There was a ketamine study on this pretty recently. You have a control group that doesn't get any drug. And then you have four groups that get, let's say, MDMA and psychotherapy, and you increase the dosage of MDMA in each group. All of these folks will probably know they get MDMA. Even minor doses will trigger experiences that are unblinding. But now you can see if the highest group with the highest dose works the best. And that would support a sort of MDMA mechanism underlying this whole thing.