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Professional In 1991 , Stebbins signed as a developmental player with the Milwaukee Wave of the National Professional Soccer League .
 Professional, Stebbins, Milwaukee Wave, National Professional Soccer League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Professional, Stebbins, Milwaukee Wave, National Professional Soccer League