4820
Thus , competitors had to be born before July 1 , 1998 but not earlier than July 1 , 1992 , except male pair skaters and ice dancers who could be born no earlier than July 1 , 1990 .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None