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}                               
 ¦   ¦--SYMBOL_SUB: a [0/1] {5}                        
 ¦   ¦--EQ_SUB: = [0/7] {6}                            
 ¦   ¦--expr:  [1/0] {8}                               
 ¦   ¦   °--NUM_CONST: 5 [0/0] {7}                     
 ¦   ¦--',': , [0/5] {9}                               
 ¦   ¦--expr:  [1/0] {11}                              
 ¦   ¦   °--SYMBOL: b [0/0] {10}                       
 ¦   °--')': ) [0/0] {12}                              
 °--expr:  [2/0] {13}                                  
     ¦--expr:  [0/0] {15}                              
     ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {14}      
     ¦--'(': ( [0/0] {16}                              
     ¦--SYMBOL_SUB: a [0/1] {17}                       
     ¦--EQ_SUB: = [0/7] {18}                           
     ¦--expr:  [1/0] {20}                              
     ¦   °--NUM_CONST: 5 [0/0] {19}                    
     ¦--',': , [0/5] {21}                              
     ¦--expr:  [1/5] {23}                              
     ¦   °--SYMBOL: b [0/0] {22}                       
     °--')': ) [1/0] {24}                              
