2
pptree (LEAF Korea)
|
2
pptree (NODE (LEAF Korea, LEAF Portugal))
 | 
|-|
2
pptree (NODE (NODE (NODE (LEAF Korea, LEAF Portugal), NODE (LEAF Italy, LEAF Usa)), LEAF Brazil))
       |       
   |-------|   
 |---|     |   
|-| |-|    |   
2
pptree (NODE (NODE (NODE (LEAF Korea, LEAF Portugal), NODE (LEAF Poland, NODE (LEAF Italy, LEAF Usa))), LEAF Brazil))
               |               
       |---------------|       
   |-------|           |       
 |---|   |---|         |       
 |   |   |  |-|        |    
2
pptree (NODE (NODE (NODE (NODE (LEAF Korea, LEAF France), NODE (LEAF Usa, LEAF Brazil)), NODE (NODE (LEAF Japan, LEAF Nigeria), NODE (LEAF Cameroon, LEAF Poland))), NODE (NODE (NODE (LEAF Portugal, LEAF Italy), NODE (LEAF Germany, LEAF Sweden)), NODE (NODE (LEAF England, LEAF Croatia), LEAF Argentina))))
               |               
       |---------------|       
   |-------|       |-------|   
 |---|   |---|   |---|   |---| 
|-| |-| |-| |-| |-| |-| |-|  |