+----COMP:V-N(of)----+    
                    |            +SUBJ:V-+    
                    |            |       |    
 Association of __NODE__ and __NODE__ occurs .
COMP:V-N(of) (occur,__NODE__)
SUBJ:V-N (occur,__NODE__)

      +--------MOD_ATT:N-N-------+            
      |             +MOD_ATT:N-AD+SUBJ:V-+    
      |             |            |       |    
 Association of __NODE__ and __NODE__ occurs .
MOD_ATT:N-N (__NODE__,Association)
MOD_ATT:N-ADJ (__NODE__,__NODE__)
SUBJ:V-N (occur,__NODE__)