Compare two triplets based on their index values, first by column and
 second by row. Returns A < B.
    
    Arguments
    
      
      
| Type | 
Intent | Optional | 
Attributes |  | Name |  | 
  
  
  
  
  
  | type(Triplet_r), | 
  intent(in) | 
   | 
  
   | :: | 
  tripA | First triplet.  | 
  
  
  
  
  
  
  | type(Triplet_r), | 
  intent(in) | 
   | 
  
   | :: | 
  tripB | Second triplet.  | 
  
      
    
    
  
  
  
  
     Return Value logical
  
  A < B.