What does the token selection method in the simulation mode exactly do?

Created by Kenneth Yrke Jørgensen
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When a transition is fired, there might be several tokens in an input place of that transition with their ages within the time interval specified on the arc connecting the place to the transition. In this case the user has to specify which tokens are consumed when the transition is fired. This can be done by selecting a random token (Random), the youngest available token (Youngest), the oldest available token (Oldest) or the exact token can be selected manually (Manual).