93703
The all-grass field stipulation caused the league to skip over several of the country 's largest markets , including Houston and Philadelphia , since they lacked a large grass stadium in 2001 .
 Houston, Philadelphia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Houston, Philadelphia