ROOT (token: short_text [lag_newlines/spaces] {pos_id})  
 °--expr:  [0/0] {1}                                     
     ¦--expr:  [0/0] {3}                                 
     ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {2}         
     ¦--'(': ( [0/0] {4}                                 
     ¦--expr:  [0/0] {6}                                 
     ¦   °--NUM_CONST: 1 [0/0] {5}                       
     ¦--',': , [0/0] {7}                                 
     ¦--expr:  [1/0] {8}                                 
     ¦   ¦--expr:  [0/0] {10}                            
     ¦   ¦   °--SYMBOL_FUNCTION_CALL: call2 [0/0] {9}    
     ¦   ¦--'(': ( [0/0] {11}                            
     ¦   ¦--expr:  [0/0] {12}                            
     ¦   ¦   ¦--expr:  [0/0] {14}                        
     ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {13}
     ¦   ¦   ¦--'(': ( [0/0] {15}                        
     ¦   ¦   ¦--expr:  [0/0] {17}                        
     ¦   ¦   ¦   °--NUM_CONST: 3 [0/0] {16}              
     ¦   ¦   ¦--',': , [0/12] {18}                       
     ¦   ¦   ¦--expr:  [0/0] {20}                        
     ¦   ¦   ¦   °--NUM_CONST: 1 [0/0] {19}              
     ¦   ¦   ¦--',': , [0/1] {21}                        
     ¦   ¦   ¦--expr:  [0/0] {23}                        
     ¦   ¦   ¦   °--NUM_CONST: 2 [0/0] {22}              
     ¦   ¦   °--')': ) [0/0] {24}                        
     ¦   ¦--',': , [0/2] {25}                            
     ¦   ¦--expr:  [1/0] {27}                            
     ¦   ¦   °--NUM_CONST: 4 [0/0] {26}                  
     ¦   °--')': ) [0/0] {28}                            
     °--')': ) [0/0] {29}                                
