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Our retrospective series included 107 patients operated for testicular tumors : 98 typical seminomas , six embryonal carcinomas , one mixed embryonal choriocarcinoma , and two Leydig cells tumors .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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