1. Before the meeting, assume that all individuals will go to the bathroom just after entering the meeting place. When the individual goes to the bathroom, the status of the individual is recorded as having been to the bathroom. <br>2. Estimate the time interval for each individual to go to the bathroom next time, and calculate the time when the individual goes to the bathroom next time based on the time when each individual went to the bathroom last time. <br>3. Record the time when the individual goes to the bathroom, and then estimate the length of time the individual goes to the bathroom after the individual enters the bathroom (the time length obeys the gamma distribution, about 3 minutes). <br>4. After the individual finishes going to the bathroom, the individual continues to walk randomly from the bathroom exit (a certain coordinate range). Repeat 2~4 steps at the same time
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