A scientist will perform six experiments - P, R, T, X, Y, and z - during a three-month period, August through October. In each of the three months, exactly two of the experiments will be performed. Each experiment will start on the first day of a month and be completed during that month, The order in which the experiments are performed will also be governed by the following restrictions:
R must be performed in August or in September.
T must be performed in September or in October.
T cannot be performed in the same month in which X is performed.
X must be performed in an earlier month than the month in which Z is performed.