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Kiger then started work at Trammell Crow in Houston , Texas , during which time he came up with the idea to start Worldwide Express .
 Trammell Crow, Houston , Texas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Trammell Crow, Houston , Texas