add-city newyork
add-city boston
add-city newyork
add-link boston newyork
add-link boston newark
add-link newyork boston
neighbors boston
neighbors newyork
add-city newark
add-link newark newyork
neighbors philadelphia
add-city providence
add-link providence boston
add-city albany
add-city philadelphia
add-link philadelphia newark
add-city baltimore
add-link philadelphia baltimore
neighbors newark
add-link newyork albany
neighbors newyork
remove-city newyork
add-city newyork
add-city washington
add-link newyork providence
add-link newyork newark
add-link newyork baltimore
add-link baltimore washington
add-city pittsburgh
add-city cleveland
add-city buffalo
add-city bloomington
add-city chicago
add-link pittsburgh cleveland
add-link cleveland buffalo
add-link cleveland bloomington
add-link bloomington chicago
add-city harrisburg
add-link philadelphia harrisburg
add-link philadelphia pittsburgh
add-link harrisburg pittsburgh
add-link boston newyork
remove-link philadelphia pittsburgh
neighbors newyork
neighbors boston
neighbors newark
neighbors philadelphia
neighbors providence
neighbors albany
neighbors baltimore
neighbors washington
neighbors pittsburgh
neighbors cleveland
neighbors buffalo
neighbors bloomington
neighbors chicago
neighbors harrisburg