+---------------SUBJ:V-N--------------+    
      +---------COMP:N-N(of)--------+       |    
      |            +---MOD_ATT:N-N--+       |    
      |            |                |       |    
 Containment of surface loop in __NODE__ occurs .
COMP:N-N(of) (containment,__NODE__)
MOD_ATT:N-N (__NODE__,surface)
SUBJ:V-N (occur,containment)