5223
A more informal way of making the distinction is to say , quoting the Encyclopedia of Mathematics , that " every node has a left child , a right child , neither , or both " and to specify that these " are all different " binary trees .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None