17499
The baseball bats which are legal for use in Major League Baseball are frequently made of ash wood or hickory , and in recent years have been constructed from maple even though that wood is somewhat more fragile .
 Major League Baseball
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Major League Baseball