192176
When Tchaikovsky left Podushkino on September 13 to visit his sister Alexandra at her estate at Kamenka in the Ukraiine , his priority was to finish this suite .
 Tchaikovsky
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tchaikovsky