add-city newyork
add-city boston
add-city philadelphia
add-link philadelphia newyork
add-city providence
place-evader student boston
add-city chicago
add-link providence boston
add-city albany
add-link newyork albany
add-city baltimore
add-link newyork providence
place-pursuer ta1 baltimore
add-link albany boston
add-link newyork boston
add-link philadelphia baltimore
place-pursuer ta2 philadelphia
tick
remove-city newyork
tick
tick
place-pursuer ta3 chicago
tick
remove-city chicago
tick
remove-city boston
remove-city albany
remove-city providence
tick
tick
tick