6984
When completed , it will be part of a trail system between Pittsburgh and Washington , D.C , known as the Great Allegheny Passage .
 location: Pittsburgh; location: Washington , D.C
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Pittsburgh; location: Washington , D.C